Front. Environ. Sci.Frontiers in Environmental ScienceFront. Environ. Sci.2296-665XFrontiers Media S.A.102631610.3389/fenvs.2022.1026316Environmental ScienceOriginal ResearchAnalyzing the effect of different types of pollution with bipolar complex fuzzy power Bonferroni mean operatorsYang et al.10.3389/fenvs.2022.1026316YangXiaopeng1*MahmoodTahir2Ur RehmanUbaid21School of Mathematics and Statistics, Hanshan Normal University, Chaozhou, China2Department of Mathematics and Statistics, International Islamic University Islamabad, Islamabad, Pakistan
Edited by:Shi Yin, Agricultural University of Hebei, China
Reviewed by:Goran Cirovic, University of Novi Sad, Serbia
Hamed Fazlollahtabar, Iran University of Science and Technology, Iran
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When any amount of harmful materials (any substance or any type of energy) is introduced into the climate at a rate quicker than it very well may be scattered or securely put away, then pollution occurs. These harmful materials are known as pollutants which can be natural and can also be manmade such as trash generated by factories. These harmful materials harm the quality of land, air, and water and cause various types of pollution, which affects the environment. In this article, we analyze the effect of various types of pollution on the environment and evaluate the most harmful type of pollution through an illustrative example by employing power Bonferroni mean (BM) operators in the setting of the bipolar complex fuzzy set (BCFS), like bipolar complex fuzzy (BCF) power BM (BCFPBM), BCF weighted power BM (BCFWPBM), BCF power geometric BM (BCFPGBM), and BCF weighted power geometric BM (BCFWPGBM) operators and a decision-making (DM) procedure created on these operators in the environment of the BCFS which are introduced in this article. Furthermore, we illustrate that the introduced operators and a DM procedure in the environment of the BCFS are more effective and have a wide model and advantages than certain prevailing works.
Bonferroni mean operatorsbipolar complex fuzzy setpollutionenvironmentdecision-making procedure61877014National Natural Science Foundation of China10.13039/501100001809Introduction
According to Pure Earth (an environmental organization), over 200 million people from all over the world are affected by toxic pollution. In certain parts of the world where pollution is high, women give birth to babies with defects, children have lost 30 to 40 IQ points, and the average life might be around 45 years due to various kinds of diseases. Various things beneficial to people cause pollution, such as generating electricity from burning coal, cars discharging through exhaust pipes, sewage and garbage produced by homes and industries, and utilizing pesticides and herbicides. Finding out which pollutants have greater effects on the environment is a genuine life DM issue.
Zadeh (1965) introduced the model of the fuzzy set (FS) for addressing abstruse and ambiguous information in genuine life issues. Before the model of the FS, there was a model of a crisp set in which every element has a satisfying grade (SG), either 0 or 1. In the FS, every element has a satisfying grade either 0 or 1 or any value between them. Thus, the FS is a generalization of the crisp set, enlarging the range from the set of 0 and 1 to the interval [0,1]. Scholars have employed the FS in various fields, such as DM (De, 2020), economy (Rytova and Gutman, 2019), and medicine (Choudhury et al., 2021). Kwon et al. (2022) combined the AHP and FS theory. Gulistan et al. (2022) described a new fuzzy decision support system. Jiang (2022) presented an improved algorithm for the FS. Chen and Tian (2022) developed the FS QCA approach. Scholars have often modified the FS and defined additional models because of the lack of the ability of the FS to address more complicated information such as the complex interval-valued Pythagorean fuzzy set (Ali et al., 2021), distance measures based on picture FS (PFS), rough set (Sahu et al., 2021), interval-valued PFS (Ashraf et al., 2022), and DM approach based on the integration of the fuzzy CoCoSO method (Narang et al., 2022).
Zhang (1994) introduced one of the modifications of the FS called the bipolar FS (BFS). In the BFS, every element has a positive satisfying grade (PSG) between 0 and 1 and a negative satisfying grade between −1 and 0. Singh (2022) interpreted bipolar fuzzy (BF) concept reduction by granular-based weighted entropy. Pandey et al. (2022) described BF centrality measures. The graphs in the environment of the BF set were studied by various authors, including Poulik and Ghorai (2020), Wan et al. (2022), and Bharathi and Felixia (2022). Gong and Hua (2022) initiated fuzzy edge connectivity in BF networks. The DM technique for BF sets was developed by Yamini et al. (2022). The multi-criteria DM (MCDM) technique for BF was created by Rajalakshmi and Mary (2022) and Garai et al. (2022). Riaz et al. (2022) defined sine trigonometric (ST) aggregation operators (AOs) for BF sets. Jana et al. (2019) introduced BF Dombi AOs (DAOs), and Wei et al. (2018) introduced BF Hamacher AOs (HAOs).
Ramot et al. (2002) developed another modification of the FS called the complex FS (CFS) because the FS cannot handle data involving a second dimension or extra fuzzy information. In the CFS, every element has a satisfying grade in {z∈C|z≤1}, i.e., a unit disc of a complex plane with SG in the polar form, i.e., reiθ. Tamir et al. (2011) have provided another version of the CFS by considering the range of the satisfying grade as a unit square in a complex plane instead of a unit circle, i.e., every element of the CFS has a satisfying grade in a unit square and is in the structure of the Cartesian form, i.e., α+iβ. Akram et al. (2021) presented a competition graph in the environment of the CFS. Zeeshan and Khan (2022) developed a DM technique based on the CFS. Akram and Bashir (2021) described ordered, weighted, quadratic, and averaging operators based on the CFS. Hu et al. (2019) proposed CF power AOs. Mahmood and Ur Rehman (2022a) provided one of the most modified models of the FS because the FS lacks the ability to tackle negative aspects of human beings, as well as information involving the second dimension, and called it a bipolar complex fuzzy set (BCFS). The BCFS also modified the model of the BFS and CFS as the BFS lacks the ability to tackle the data containing the second dimension, and the CFS lacks the ability to tackle the negative aspects of human beings. In the BCFS, every element has the PSG in the first quadrant and NSG in the third quadrant of a unit square in a complex plane. Ur Rehman and Mahmood (2022) defined generalized dice similarity measures (SM) for the bipolar complex fuzzy (BCF) set.
To get a more accurate alternative method, we have to consider the given assessment information and the relationship between them. The power average (PA) and power-ordered weighted average operators were first established by Yager (2001), which incorporate variable weights. Xu and Yager (2009) used power geometric operators, and Garg et al. (2021) established PA operators in the setting of the T-spherical FS. There is another apparatus called the BM operator defined by Bonferroni (1950), which considers the interrelationship of inputs. It has been utilized in numerous fields: the geometric BM (GBM) was used by Zhu et al. (2012), the BM operator was utilized in the intuitionistic FS (IFS) by Xu and Yager (2010), and picture fuzzy BM operators were investigated by Ateş and Akay (2020). Liu and Li (2017) developed PBM operators for the interval-valued IFS (IVFS). Furthermore, PA has the ability to ignore the effect of the smallest or largest information by taking various weights, and the BM operator has the ability to consider the interrelationship of each input argument. However, in DM issues and circumstances, the PA and DM operators lack the ability to tackle the data in the model of the BCFS.
The BCFS can easily portray fuzzy data or information containing positive and negative aspects, as well as extra fuzzy information (second dimension), and is very handy in dealing with complicated DM issues and genuine life issues. The model of the BCFS is wider and richer than certain prevailing conceptions like FS, BFS, and CFS, and numerous scholars have defined various AOs in the setting of the BCFS. Mahmood et al. (2021) have defined BCF HAOs, and Mahmood and Ur Rehman (2022b) have defined DAOs for the BCF set. Mahmood et al. (2022a) initiated AOs, and Rehman et al. (2022) presented Frank AOs in the environment of the BCF set. The BM operators based on BCFS were defined by Mahmood et al. (2022b). However, these defined AOs have their drawbacks, and these operations have one common drawback; it is that these operators cannot provide a fair and unbiased weight vector to the attributes because in these operators, the decision expert provides weight vectors to each attribute on his/her own choice. In the literature, there is no such structure or operator which can overcome this dilemma. Thus, this research gap created various questions such as
• How do we get fair and unbiased decisions if the data are in the structure of the BCFS?
• How do we make decisions if the weight vector is not given and the information is in the setting of the BCFS?
• How do we get the advantages of the combination of PA and BM operators in the environment of the BCFS?
Up until now, no one has answered these questions; thus, in this study, we answer these questions by combining PA, geometric BM, and BM operators in the environment of the BCFS to introduce BCFPBM, BCFWPBM, BCFPGBM, and BCFWPGBM operators. Furthermore, we describe what we are achieving from this study.
• The structure of the BCFS is one of the most advanced and widely used structures, and up until now, no one has defined these operators in the environment of the BCFS.
• Over time, the information became more complicated and tricky and almost impossible to handle with ordinary mathematical models and operators. This study will help handle complicated and tricky data and provide a fair decision. This study is the requirement of time.
• PA, GBM, and BM operators have their advantages; this study provides us with all these advantages together.
• To show the practical advantage of this study, we investigate a genuine-life numerical example related to the environment in this study.
• By taking the arbitrary weight vector, the introduced operators would be reduced to the BM operators, as defined by Mahmood et al. (2022b). Thus, the defined operators are the modification of BM operators, as defined by Mahmood et al. (2022b).
In the Background section, we review the basic concept of pollution and its types, as well as the idea of the BCFS and its properties. In the BCF power Bonferroni mean operators section, we introduce power BM operators in the setting of BCF sets to define BCFPBM, BCFWPBM, BCFPGBM, and BCFWPGBM operators. In the Application section, we introduce a DM procedure for solving genuine life issues and then present a numerical example related to pollution and its types. In the Comparison section, we show that the introduced PBM operators (BCFPBM, BCFWPBM, BCFPGBM, and BCFWPGBM) and a DM procedure in the environment of BCFS are more effective than other prevailing operators. The Conclusion section contains the concluding remarks of this article.
Background
The word pollution originates from the Latin word polluere, which essentially implies contamination. Thus, in a simple way, pollution is something that pollutes the climate. According to Pure Earth (an environmental organization), over 200 million people from all over the world are affected by toxic pollution. Various beneficial things can cause pollution, such as generating electricity from burning coal causes pollution in the air, cars discharging pollutants through exhaust pipes, the sewage and garbage produced by homes and industries cause water and land pollution, and the use of pesticides to kill insects and weeds causes water pollution , which is harmful to wildlife. These pollutants harm the quality of land, air, and water. Various kinds of pollution can be caused by natural events and also by artificial activities. The four major types of pollution are
1) Air pollution,
2) Water pollution,
3) Soil pollution, and
4) Noise pollution.
Figure 1 portrays the types of pollution.
Major types of pollution.
1) Air pollution: There is an exact synthetic structure of the air that we breathe. Its vast majority comprises oxygen, dormant gases, nitrogen, and water fume. When the pollutants or things are introduced in the air, which are not normally there, they cause air pollution. A usual kind of air pollution takes place when people emit particles of burning fuels into the air. This sort of pollution seems to be excess, having a large number of minuscule particles, drifting in the air. One more typical sort of air pollution is caused by harmful gases, like nitrogen oxides, sulfur dioxide, chemical fumes, and carbon monoxide. When these gases are introduced in the air, they can be a part of the chemical reactions and produce smog and acid rain. Over two million people die every year because of air pollution. The impact of air pollution on human well-being can fluctuate generally contingent upon the contamination. Assuming the poison is exceptionally harmful, the consequences for well-being can be far and wide extreme. For instance, the leakage of methyl isocyanate gas in Bhopal, India, in 1984, killed more than two thousand people, and in north, two hundred thousand people experienced respiratory issues.
2) Water pollution: When chemicals or other harmful substances such as sewage, fertilizers, metals, mercury, and pesticides are introduced into the water, then water pollution occurs. All over the world, 44 percent of streams, 64 percent of lakes, and 30 percent of the bay are not hygienic for fishing and swimming as per the Environmental Protection Agency (EPA). According to the EPA, the usual pollutants in the USA are mercury, nitrogen, bacteria, and phosphorus.
3) Soil pollution: Household and industrial garbage and waste cause soil pollution. According to the EPA, USA generated over 258 million tons of waste and garbage in 2014. More than half, i.e., 136 million tons, of the waste was assembled in landfills, and merely 34% was composted. The effects of land pollution are not that noticeable, but its implication can easily be observed. Oil spills, industrial accidents, acid rain, improper waste disposal, mining activities, etc., are a few usual reasons for soil pollution.
4) Noise pollution: despite the fact that people cannot smell or see noise pollution, it influences the climate. When various sounds reach the harmful level, for example, sound coming from industries, jets, etc., it causes noise pollution. It is obvious that there are immediate connections between well-being and noise, causing hearing loss, increase in the blood pressure, speech interference, and pressure-related ailments. For instance, according to the WHO, thousands of people die every year because of noise pollution. Ships cause underwater noise pollution. Similarly Noise pollution influence wild species to impart stronger, which can reduce their life expectancy.
(Mahmood and Ur Rehman, 2022b) The theory is modeled as follows.MBCFS={(ξ,(ΥMBCFSP(ξ),ΥMBCFSN(ξ)))|ξ∈Εξ}={(ξ,(ΥMBCFSRP(ξ)+iΥMBCFSIP(ξ),ΥMBCFSRN(ξ)+iΥMBCFSIN(ξ)))|ξ∈Εξ}is known as the BCFS, where ΥMBCFSP(ξ) is known as a positive satisfying grade and ΥMBCFSN(ξ) is known as a negative satisfying grade and ΥMBCFSRP(ξ),ΥMBCFSIP(ξ)∈[0,1] and ΥMBCFSRN(ξ),ΥMBCFSIN(ξ)∈[−1,0]. A set MBCFS=(ΥMBCFSP,ΥMBCFSN)=(ΥMBCFSRP+iΥMBCFSIP,ΥMBCFSRN+iΥMBCFSIN) is identified as the BCF number (BCFN).
(Mahmood and Ur Rehman, 2022b) For a BCFN MBCFS=(ΥMBCFSP,ΥMBCFSN)=(ΥMBCFSRP+iΥMBCFSIP,ΥMBCFSRN+iΥMBCFSIN), the score value (SV) and accuracy value (AV) would be obtained as follows:
(Mahmood and Ur Rehman, 2022b) If we have two BCFNs MBCFS−1=(ΥMBCFS−1P,ΥMBCFS−1N)=(ΥMBCFS−1RP+iΥMBCFS−1IP,ΥMBCFS−1RN+iΥMBCFS−1IN) and MBCFS−2=(ΥMBCFS−2P,ΥMBCFS−2N)=(ΥMBCFS−2RP+iΥMBCFS−2IP,ΥMBCFS−2RN+iΥMBCFS−2IN), with σ≥0, then
(He et al., 2014) Take a group of real numbers MR−ƥ=(MR−1,MR−2,MR−3,…,MR−ŋ), with u,v>0, then the power BM operator is inspected asPBMu,v(MR−1,MR−2,MR−3,…,MR−ŋ)=(1ŋ2−ŋ∑ƥ=1,ɋ=1ƥ≠ɋŋ((ŋ(Ⱦ(MR−ƥ)+1)∑l=1ŋ(Ⱦ(MR−l)+1)MBCFS−ƥ)u⊗(ŋ(Ⱦ(MR−ɋ)+1)∑l=1ŋ(Ⱦ(MR−l)+1)MBCFS−ɋ)v))1/u+v.
(He et al., 2014) Take a group of real numbers MR−ƥ=(MR−1,MR−2,MR−3,…,MR−ŋ), with u,v>0, then the power GBM operator is inspected asPGBMu,v(MR−1,MR−2,…,MR−ŋ)=1u+v(∏ƥ=1,ɋ=1ƥ≠ɋŋ(u(MR−ƥ)ŋ(Ⱦ(MR−ƥ)+1)∑l=1ŋ(Ⱦ(MR−l)+1)⊕v(MR−ɋ)ŋ(Ⱦ(MR−ɋ)+1)∑l=1ŋ(Ⱦ(MR−l)+1)))1/ŋ2−ŋ.
In Def (4) and (5), Ⱦ(MR−ƥ)=∑ɋ=1ɋ≠ƥŋSup(MR−ƥ,MR−ɋ) is the support to MR−ƥ from MR−ɋ with these axioms
1) Sup(MR−ƥ,MR−ɋ)∈[0,1],
2) Sup(MR−ƥ,MR−ɋ)=Sup(MR−ɋ,MR−ƥ),
3) Sup(MR−ƥ,MR−ɋ)≥Sup(MR−r,MR−s) if D(MR−ƥ,MR−ƥ)<D(MR−r,MR−s), where D is any distance measured.
BCF power Bonferroni mean operators
In this section of this article, we introduce power BM operators in the setting of BCF sets to define BCFPBM, BCFWPBM, BCFPGBM, and BCFWPGBM operators.
Take a group of BCFNs MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ, then the BCFPBM operator is inspected asBCFPBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=(1ŋ2−ŋ∑ƥ=1,ɋ=1ƥ≠ɋŋ((ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)MBCFS−ƥ)u⊗(ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)MBCFS−ɋ)v))1/u+v,where u,v>0 and Ⱦ(MBCFS−ƥ)=∑ɋ=1ɋ≠ƥŋSup(MBCFS−ƥ,MBCFS−ɋ) are the support to MBCFS−ƥ from MBCFS−ɋ with the following axioms
1) Sup(MBCFS−ƥ,MBCFS−ɋ)∈[0,1],
2) Sup(MBCFS−ƥ,MBCFS−ɋ)=Sup(MBCFS−ɋ,MBCFS−ƥ),
3) Sup(MBCFS−ƥ,MBCFS−ɋ)≥Sup(MBCFS−r,MBCFS−s) if D(MBCFS−ƥ,MBCFS−ƥ)<D(MBCFS−r,MBCFS−s), where D is the distance measured among BCFSs.
The aggregated outcome from Eq. 6 based on the group of BCFNs MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ is a BCFN and inspected asBCFPBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=((1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(1−ΥMBCFS−ƥRP)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))u×(1−(1−ΥMBCFS−ɋRP)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))v)))1/ŋ2−ŋ)1/u+v+i(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(1−ΥMBCFS−ƥIP)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))u×(1−(1−ΥMBCFS−ɋIP)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))v)))1/ŋ2−ŋ)1/u+v−1+(1−|−∏ƥ=1,ɋ=1ƥ≠ɋŋ(−1+(1−|ΥMBCFS−ƥRN|ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))u×(1−|ΥMBCFS−ɋRN|ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))v)|1/ŋ2−ŋ)1/u+v,+i(−1+(1−|−∏ƥ=1,ɋ=1ƥ≠ɋŋ(−1+(1−|ΥMBCFS−ƥIN|ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))u×(1−|ΥMBCFS−ɋIN|ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))v)|1/ŋ2−ŋ)1/u+v)).
Suppose that Fƥ=ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)(ƥ=1,2,…,ŋ), then Eq. 7 becomesBCFPBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=(1ŋ2−ŋ∑ƥ=1,ɋ=1ƥ≠ɋŋ((FƥMBCFS−ƥ)u⊗(FɋMBCFS−ɋ)v))1/u+v.First, determine FƥMBCFS−ƥ and FɋMBCFS−ɋ as follows:FƥMBCFS−ƥ=(1−(1−ΥMBCFS−ƥRP)Fƥ+i(1−(1−ΥMBCFS−ƥIP)Fƥ),−|ΥMBCFS−ƥRN|Fƥ+i(−|ΥMBCFS−ƥIN|Fƥ)),FɋMBCFS−ɋ=(1−(1−ΥMBCFS−ɋRP)Fɋ+i(1−(1−ΥMBCFS−ɋIP)Fɋ),−|ΥMBCFS−ɋRN|Fɋ+i(−|ΥMBCFS−ɋIN|Fɋ)).
Now,(FƥMBCFS−ƥ)u=((1−(1−ΥMBCFS−ƥRP)Fƥ)u+i(1−(1−ΥMBCFS−ƥIP)Fƥ)u,−1+(1−|ΥMBCFS−ƥRN|Fƥ)u+i(−1+(1−|ΥMBCFS−ƥIN|Fƥ)u)),(FɋMBCFS−ɋ)v=((1−(1−ΥMBCFS−ɋRP)Fɋ)v+i(1−(1−ΥMBCFS−ɋIP)Fɋ)v,−1+(1−|ΥMBCFS−ɋRN|Fɋ)v+i(−1+(1−|ΥMBCFS−ɋIN|Fɋ)v)).Now, determine (FƥMBCFS−ƥ)u⊗(FɋMBCFS−ɋ)v and get:(FƥMBCFS−ƥ)u⊗(FɋMBCFS−ɋ)v=((1−(1−ΥMBCFS−ƥRP)Fƥ)u+i(1−(1−ΥMBCFS−ƥIP)Fƥ)u,−1+(1−|ΥMBCFS−ƥRN|Fƥ)u+i(−1+(1−|ΥMBCFS−ƥIN|Fƥ)u))⊗((1−(1−ΥMBCFS−ɋRP)Fɋ)v+i(1−(1−ΥMBCFS−ɋIP)Fɋ)v,−1+(1−|ΥMBCFS−ɋRN|Fɋ)v+i(−1+(1−|ΥMBCFS−ɋIN|Fɋ)v))=((1−(1−ΥMBCFS−ƥRP)Fƥ)u×(1−(1−ΥMBCFS−ɋRP)Fɋ)v+i((1−(1−ΥMBCFS−ƥIP)Fƥ)u×(1−(1−ΥMBCFS−ɋIP)Fɋ)v),(−1+(1−|ΥMBCFS−ƥRN|Fƥ)u)+(−1+(1−|ΥMBCFS−ɋRN|Fɋ)v)+(−1+(1−|ΥMBCFS−ƥRN|Fƥ)u)×(−1+(1−|ΥMBCFS−ɋRN|Fɋ)v)+i((−1+(1−|ΥMBCFS−ƥIN|Fƥ)u)+(−1+(1−|ΥMBCFS−ɋIN|Fɋ)v)+(−1+(1−|ΥMBCFS−ƥIN|Fƥ)u)×(−1+(1−|ΥMBCFS−ɋIN|Fɋ)v)))=((1−(1−ΥMBCFS−ƥRP)Fƥ)u×(1−(1−ΥMBCFS−ɋRP)Fɋ)v+i((1−(1−ΥMBCFS−ƥIP)Fƥ)u×(1−(1−ΥMBCFS−ɋIP)Fɋ)v),−1+(1+(−1+(1−|ΥMBCFS−ƥRN|Fƥ)u)+(−1+(1−|ΥMBCFS−ɋRN|Fɋ)v)(−1+(1−|ΥMBCFS−ƥRN|Fƥ)u)×(−1+(1−|ΥMBCFS−ɋRN|Fɋ)v))+i(−1+(1+(−1+(1−|ΥMBCFS−ƥIN|Fƥ)u)+(−1+(1−|ΥMBCFS−ɋIN|Fɋ)v)(−1+(1−|ΥMBCFS−ƥIN|Fƥ)u)×(−1+(1−|ΥMBCFS−ɋIN|Fɋ)v))))=((1−(1−ΥMBCFS−ƥRP)Fƥ)u×(1−(1−ΥMBCFS−ɋRP)Fɋ)v+i((1−(1−ΥMBCFS−ƥIP)Fƥ)u×(1−(1−ΥMBCFS−ɋIP)Fɋ)v),−1+((−1+(1−|ΥMBCFS−ƥRN|Fƥ)u)(1+(−1+(1−|ΥMBCFS−ɋRN|Fɋ)v))+1(1+(−1+(1−|ΥMBCFS−ɋRN|Fɋ)v)))+i(−1+((−1+(1−|ΥMBCFS−ƥIN|Fƥ)u)(1+(−1+(1−|ΥMBCFS−ɋIN|Fɋ)v))+1(1+(−1+(1−|ΥMBCFS−ɋIN|Fɋ)v)))))=((1−(1−ΥMBCFS−ƥRP)Fƥ)u×(1−(1−ΥMBCFS−ɋRP)Fɋ)v+i((1−(1−ΥMBCFS−ƥIP)Fƥ)u×(1−(1−ΥMBCFS−ɋIP)Fɋ)v),−1+(1+(−1+(1−|ΥMBCFS−ƥRN|Fƥ)u)×(1+(−1+(1−|ΥMBCFS−ɋRN|Fɋ)v)))+i(−1+(1+(−1+(1−|ΥMBCFS−ƥIN|Fƥ)u)×(1+(−1+(1−|ΥMBCFS−ɋIN|Fɋ)v)))))=((1−(1−ΥMBCFS−ƥRP)Fƥ)u×(1−(1−ΥMBCFS−ɋRP)Fɋ)v+i((1−(1−ΥMBCFS−ƥIP)Fƥ)u×(1−(1−ΥMBCFS−ɋIP)Fɋ)v),−1+(1−|ΥMBCFS−ƥRN|Fƥ)u×(1−|ΥMBCFS−ɋRN|Fɋ)v+i(−1+(1−|ΥMBCFS−ƥIN|Fƥ)u×(1−|ΥMBCFS−ɋIN|Fɋ)v)).Next, determine ∑ƥ=1,ɋ=1ƥ≠ɋŋ(FƥMBCFS−ƥ)u⊗(FɋMBCFS−ɋ)v∑ƥ=1,ɋ=1ƥ≠ɋŋ(FƥMBCFS−ƥ)u⊗(FɋMBCFS−ɋ)v=(1−∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(1−ΥMBCFS−ƥRP)Fƥ)u×(1−(1−ΥMBCFS−ɋRP)Fɋ)v))+i(1−∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(1−ΥMBCFS−ƥIP)Fƥ)u×(1−(1−ΥMBCFS−ɋIP)Fɋ)v)))−∏ƥ=1,ɋ=1ƥ≠ɋŋ(−1+(1−|ΥMBCFS−ƥRN|Fƥ)u×(1−|ΥMBCFS−ɋRN|Fɋ)v),+i(−∏ƥ=1,ɋ=1ƥ≠ɋŋ(−1+(1−|ΥMBCFS−ƥIN|Fƥ)u×(1−|ΥMBCFS−ɋIN|Fɋ)v))).
Now,1ŋ2−ŋ∑ƥ=1,ɋ=1ƥ≠ɋŋ(FƥMBCFS−ƥ)u⊗(FɋMBCFS−ɋ)v=(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(1−ΥMBCFS−ƥRP)Fƥ)u×(1−(1−ΥMBCFS−ɋRP)Fɋ)v)))1/ŋ2−ŋ+i(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(1−ΥMBCFS−ƥIP)Fƥ)u×(1−(1−ΥMBCFS−ɋIP)Fɋ)v)))1/ŋ2−ŋ)−|−∏ƥ=1,ɋ=1ƥ≠ɋŋ(−1+(1−|ΥMBCFS−ƥRN|Fƥ)u×(1−|ΥMBCFS−ɋRN|Fɋ)v)|1/ŋ2−ŋ,+i(−|−∏ƥ=1,ɋ=1ƥ≠ɋŋ(−1+(1−|ΥMBCFS−ƥIN|Fƥ)u×(1−|ΥMBCFS−ɋIN|Fɋ)v)|1/ŋ2−ŋ)).Finally, determine (1ŋ2−ŋ∑ƥ=1,ɋ=1ƥ≠ɋŋ(FƥMBCFS−ƥ)u⊗(FɋMBCFS−ɋ)v)1/u+v as(1ŋ2−ŋ∑ƥ=1,ɋ=1ƥ≠ɋŋ(FƥMBCFS−ƥ)u⊗(FɋMBCFS−ɋ)v)1/u+v=((1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(1−ΥMBCFS−ƥRP)Fƥ)u×(1−(1−ΥMBCFS−ɋRP)Fɋ)v)))1/ŋ2−ŋ)1/u+v+i(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(1−ΥMBCFS−ƥIP)Fƥ)u×(1−(1−ΥMBCFS−ɋIP)Fɋ)v)))1/ŋ2−ŋ)1/u+v−1+(1−|−∏ƥ=1,ɋ=1ƥ≠ɋŋ(−1+(1−|ΥMBCFS−ƥRN|Fƥ)u×(1−|ΥMBCFS−ɋRN|Fɋ)v)|1/ŋ2−ŋ)1/u+v,+i(−1+(1−|−∏ƥ=1,ɋ=1ƥ≠ɋŋ(−1+(1−|ΥMBCFS−ƥIN|Fƥ)u×(1−|ΥMBCFS−ɋIN|Fɋ)v)|1/ŋ2−ŋ)1/u+v)).Now, replace Fƥ=ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1) in Eq. 9, then(1ŋ2−ŋ∑ƥ=1,ɋ=1ƥ≠ɋŋ((ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)MBCFS−ƥ)u⊗(ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)MBCFS−ɋ)v))1/u+v=((1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(1−ΥMBCFS−ƥRP)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))u×(1−(1−ΥMBCFS−ɋRP)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))v)))1/ŋ2−ŋ)1/u+v+i(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(1−ΥMBCFS−ƥIP)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))u×(1−(1−ΥMBCFS−ɋIP)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))v)))1/ŋ2−ŋ)1/u+v−1+(1−|−∏ƥ=1,ɋ=1ƥ≠ɋŋ(−1+(1−|ΥMBCFS−ƥRN|ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))u×(1−|ΥMBCFS−ɋRN|ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))v)|1/ŋ2−ŋ)1/u+v,+i(−1+(1−|−∏ƥ=1,ɋ=1ƥ≠ɋŋ(−1+(1−|ΥMBCFS−ƥIN|ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))u×(1−|ΥMBCFS−ɋIN|ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))v)|1/ŋ2−ŋ)1/u+v))=BCFPBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ).
The BCFPBM operator holds the following axioms.
1) Idempotency: Let MBCFS−ƥ=MBCFS=(ΥMBCFSP,ΥMBCFSN)=(ΥMBCFSRP+iΥMBCFSIP,ΥMBCFSRN+iΥMBCFSIN),ƥ=1,2,..,ŋ. Then,
BCFPBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=MBCFS.
2) Commutativity: Let MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ have the permutation MBCFS−ƥ′=(ΥMBCFS−ƥ′P,ΥMBCFS−ƥ′N)=(ΥMBCFS−ƥ′RP+iΥMBCFS−ƥ′IP,ΥMBCFS−ƥ′RN+iΥMBCFS−ƥ′IN),ƥ=ƥ,2,…,ŋ. Then,
3) Boundedness: Let a group of BCFNs MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ and let MBCFS−=(minƥ{ΥMBCFS−ƥRP}+iminƥ{ΥMBCFS−ƥIP},maxƥ{ΥMBCFS−ƥRN}+imaxƥ{ΥMBCFS−ƥIN}) and MBCFS+=(maxƥ{ΥMBCFS−ƥRP}+imaxƥ{ΥMBCFS−ƥIP},minƥ{ΥMBCFS−ƥRN}+iminƥ{ΥMBCFS−ƥIN}). Then,
Take a group of BCFNs MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ, then the BCFWPBM operator is inspected asBCFWPBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=(1ŋ2−ŋ∑ƥ=1,ɋ=1ƥ≠ɋŋ((ŋwv−ƥ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1)MBCFS−ƥ)u⊗(ŋwv−ɋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1)MBCFS−ɋ)v))1/u+v,where u,v>0 and Ⱦ(MBCFS−ƥ)=∑ɋ=1ɋ≠ƥŋSup(MBCFS−ƥ,MBCFS−ɋ), and wv=(wv−1,wv−2,…,wv−ŋ) is the weight vector (WV) with the property that wv−ƥ∈[0,1] and ∑ƥ=1ŋwv−ƥ=1.
The aggregated outcome from Eq. 10 based on the group of BCFNs MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ is a BCFN and inspected asBCFWPBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=((1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(1−ΥMBCFS−ƥRP)ŋwv−ƥ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1))u×(1−(1−ΥMBCFS−ɋRP)ŋwv−ɋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1))v)))1/ŋ2−ŋ)1/u+v+i(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(1−ΥMBCFS−ƥIP)ŋwv−ƥ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1))u×(1−(1−ΥMBCFS−ɋIP)ŋwv−ɋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1))v)))1/ŋ2−ŋ)1/u+v−1+(1−|−∏ƥ=1,ɋ=1ƥ≠ɋŋ(−1+(1−|ΥMBCFS−ƥRN|ŋwv−ƥ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1))u×(1−|ΥMBCFS−ɋRN|ŋwv−ɋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1))v)|1/ŋ2−ŋ)1/u+v,+i(−1+(1−|−∏ƥ=1,ɋ=1ƥ≠ɋŋ(−1+(1−|ΥMBCFS−ƥIN|ŋwv−ƥ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1))u×(1−|ΥMBCFS−ɋIN|ŋwv−ɋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1))v)|1/ŋ2−ŋ)1/u+v)).
The BCFWPBM operator holds the following axioms.
1) Idempotency: Let MBCFS−ƥ=MBCFS=(ΥMBCFSP,ΥMBCFSN)=(ΥMBCFSRP+iΥMBCFSIP,ΥMBCFSRN+iΥMBCFSIN),ƥ=1,2,..,ŋ. Then,
BCFWPBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=MBCFS.
2) Commutativity: LetMBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ have the permutation MBCFS−ƥ′=(ΥMBCFS−ƥ′P,ΥMBCFS−ƥ′N)=(ΥMBCFS−ƥ′RP+iΥMBCFS−ƥ′IP,ΥMBCFS−ƥ′RN+iΥMBCFS−ƥ′IN),ƥ=ƥ,2,…,ŋ. Then,
3) Boundedness: Let a group of BCFNs MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ and let MBCFS−=(minƥ{ΥMBCFS−ƥRP}+iminƥ{ΥMBCFS−ƥIP},maxƥ{ΥMBCFS−ƥRN}+imaxƥ{ΥMBCFS−ƥIN}) and MBCFS+=(maxƥ{ΥMBCFS−ƥRP}+imaxƥ{ΥMBCFS−ƥIP},minƥ{ΥMBCFS−ƥRN}+iminƥ{ΥMBCFS−ƥIN}). Then,
Take a group of BCFNs MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ, then the BCFPGBM operator is inspected asBCFPGBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=1u+v(∏ƥ=1,ɋ=1ƥ≠ɋŋ(u(MBCFS−ƥ)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)⊕v(MBCFS−ɋ)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)))1/ŋ2−ŋ,where u,v>0 and Ⱦ(MBCFS−ƥ)=∑ɋ=1ɋ≠ƥŋSup(MBCFS−ƥ,MBCFS−ɋ) is the support to MBCFS−ƥ from MBCFS−ɋ with these axioms:
1) Sup(MBCFS−ƥ,MBCFS−ɋ)∈[0,1],
2) Sup(MBCFS−ƥ,MBCFS−ɋ)=Sup(MBCFS−ɋ,MBCFS−ƥ),
3) Sup(MBCFS−ƥ,MBCFS−ɋ)≥Sup(MBCFS−r,MBCFS−s) if D(MBCFS−ƥ,MBCFS−ƥ)<D(MBCFS−r,MBCFS−s), where D is the distance measured among BCFSs.
The aggregated outcome from Eq. 12 based on the group of BCFNs MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ is a BCFN and inspected asBCFPGBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=(1−(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(ΥMBCFS−ƥRP)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))u×(1−(ΥMBCFS−ɋRP)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))v)))1/ŋ2−ŋ)1/u+v+i(1−(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(ΥMBCFS−ƥIP)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))u×(1−(ΥMBCFS−ɋIP)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))v)))1/ŋ2−ŋ)1/u+v),−|−1+(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((−|−1+(1+ΥMBCFS−ƥRN)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)|u×(−|−1+(1+ΥMBCFS−ɋRN)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)|v)))))1/ŋ2−ŋ|1/u+v+i(−|−1+(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((−|−1+(1+ΥMBCFS−ƥIN)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)|u×(−|−1+(1+ΥMBCFS−ɋIN)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)|v)))))1/ŋ2−ŋ|1/u+v)).
Suppose that Fƥ=ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)(ƥ=1,2,…,ŋ), then Eq. 13 becomesBCFGPBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=1u+v(∏ƥ=1,ɋ=1ƥ≠ɋŋ(u(MBCFS−ƥ)Fƥ⊕v(MBCFS−ɋ)Fɋ))1/ŋ2−ŋ.First, determine (MBCFS−ƥ)Fƥ and (MBCFS−ɋ)Fɋ as follows:(MBCFS−ƥ)Fƥ=((ΥMBCFS−ƥRP)Fƥ+i(ΥMBCFS−ƥIP)Fƥ,−1+(1+ΥMBCFS−ƥRN)Fƥ+i(−1+(1+ΥMBCFS−ƥIN)Fƥ)),(MBCFS−ɋ)Fɋ=((ΥMBCFS−ɋRP)Fɋ+i(ΥMBCFS−ɋIP)Fɋ,−1+(1+ΥMBCFS−ɋRN)Fɋ+i(−1+(1+ΥMBCFS−ɋIN)Fɋ)).
Now,u(MBCFS−ƥ)Fƥ=(1−(1−(ΥMBCFS−ƥRP)Fƥ)u+i(1−(1−(ΥMBCFS−ƥIP)Fƥ)u),−|−1+(1+ΥMBCFS−ƥRN)Fƥ|u+i(−|−1+(1+ΥMBCFS−ƥIN)Fƥ|u)),v(MBCFS−ɋ)Fɋ=(1−(1−(ΥMBCFS−ɋRP)Fɋ)v+i(1−(1−(ΥMBCFS−ɋIP)Fɋ)v),−|−1+(1+ΥMBCFS−ɋRN)Fɋ|v+i(−|−1+(1+ΥMBCFS−ɋIN)Fɋ|v)).Now, determine u(MBCFS−ƥ)Fƥ⊕v(MBCFS−ɋ)Fɋ and getu(MBCFS−ƥ)Fƥ⊕v(MBCFS−ɋ)Fɋ=(1−(1−(ΥMBCFS−ƥRP)Fƥ)u+i(1−(1−(ΥMBCFS−ƥIP)Fƥ)u),−|−1+(1+ΥMBCFS−ƥRN)Fƥ|u+i(−|−1+(1+ΥMBCFS−ƥIN)Fƥ|u))⊗(1−(1−(ΥMBCFS−ɋRP)Fɋ)v+i(1−(1−(ΥMBCFS−ɋIP)Fɋ)v),−|−1+(1+ΥMBCFS−ɋRN)Fɋ|v+i(−|−1+(1+ΥMBCFS−ɋIN)Fɋ|v))=(1−(1−(ΥMBCFS−ƥRP)Fƥ)u+1−(1−(ΥMBCFS−ɋRP)Fɋ)v−((1−(1−(ΥMBCFS−ƥRP)Fƥ)u)×(1−(1−(ΥMBCFS−ɋRP)Fɋ)v))+i(1−(1−(ΥMBCFS−ƥIP)Fƥ)u+1−(1−(ΥMBCFS−ɋIP)Fɋ)v−((1−(1−(ΥMBCFS−ƥIP)Fƥ)u)×(1−(1−(ΥMBCFS−ɋIP)Fɋ)v))),−((−|−1+(1+ΥMBCFS−ƥRN)Fƥ|u×(−|−1+(1+ΥMBCFS−ɋRN)Fɋ|v)))+i(−((−|−1+(1+ΥMBCFS−ƥIN)Fƥ|u×(−|−1+(1+ΥMBCFS−ɋIN)Fɋ|v)))))=(1−((1−(ΥMBCFS−ƥRP)Fƥ)u×(1−(ΥMBCFS−ɋRP)Fɋ)v)+i(1−((1−(ΥMBCFS−ƥIP)Fƥ)u×(1−(ΥMBCFS−ɋIP)Fɋ)v)),−((−|−1+(1+ΥMBCFS−ƥRN)Fƥ|u×(−|−1+(1+ΥMBCFS−ɋRN)Fɋ|v)))+i(−((−|−1+(1+ΥMBCFS−ƥIN)Fƥ|u×(−|−1+(1+ΥMBCFS−ɋIN)Fɋ|v))))).Next, determine ∏ƥ=1,ɋ=1ƥ≠ɋŋ(u(MBCFS−ƥ)Fƥ⊕v(MBCFS−ɋ)Fɋ).∏ƥ=1,ɋ=1ƥ≠ɋŋ(u(MBCFS−ƥ)Fƥ⊕v(MBCFS−ɋ)Fɋ)=(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(ΥMBCFS−ƥRP)Fƥ)u×(1−(ΥMBCFS−ɋRP)Fɋ)v))+i∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(ΥMBCFS−ƥIP)Fƥ)u×(1−(ΥMBCFS−ɋIP)Fɋ)v)),−1+∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((−|−1+(1+ΥMBCFS−ƥRN)Fƥ|u×(−|−1+(1+ΥMBCFS−ɋRN)Fɋ|v))))−1+∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((−|−1+(1+ΥMBCFS−ƥIN)Fƥ|u×(−|−1+(1+ΥMBCFS−ɋIN)Fɋ|v))))).
Now,(∏ƥ=1,ɋ=1ƥ≠ɋŋ(u(MBCFS−ƥ)Fƥ⊕v(MBCFS−ɋ)Fɋ))1/ŋ2−ŋ=((∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(ΥMBCFS−ƥRP)Fƥ)u×(1−(ΥMBCFS−ɋRP)Fɋ)v)))1/ŋ2−ŋ+i(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(ΥMBCFS−ƥIP)Fƥ)u×(1−(ΥMBCFS−ɋIP)Fɋ)v)))1/ŋ2−ŋ,−1+(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((−|−1+(1+ΥMBCFS−ƥRN)Fƥ|u×(−|−1+(1+ΥMBCFS−ɋRN)Fɋ|v)))))1/ŋ2−ŋ+i(−1+(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((−|−1+(1+ΥMBCFS−ƥIN)Fƥ|u×(−|−1+(1+ΥMBCFS−ɋIN)Fɋ|v)))))1/ŋ2−ŋ)).Finally, determine 1u+v(∏ƥ=1,ɋ=1ƥ≠ɋŋ(u(MBCFS−ƥ)Fƥ⊕v(MBCFS−ɋ)Fɋ))1/ŋ2−ŋ as follows:1u+v(∏ƥ=1,ɋ=1ƥ≠ɋŋ(u(MBCFS−ƥ)Fƥ⊕v(MBCFS−ɋ)Fɋ))1/ŋ2−ŋ=(1−(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(ΥMBCFS−ƥRP)Fƥ)u×(1−(ΥMBCFS−ɋRP)Fɋ)v)))1/ŋ2−ŋ)1/u+v+i(1−(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(ΥMBCFS−ƥIP)Fƥ)u×(1−(ΥMBCFS−ɋIP)Fɋ)v)))1/ŋ2−ŋ)1/u+v),−|−1+(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((−|−1+(1+ΥMBCFS−ƥRN)Fƥ|u×(−|−1+(1+ΥMBCFS−ɋRN)Fɋ|v)))))1/ŋ2−ŋ|1/u+v+i(−|−1+(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((−|−1+(1+ΥMBCFS−ƥIN)Fƥ|u×(−|−1+(1+ΥMBCFS−ɋIN)Fɋ|v)))))1/ŋ2−ŋ|1/u+v)).Now, replace Fƥ=ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1) in Eq. 15, then1u+v(∏ƥ=1,ɋ=1ƥ≠ɋŋ(u(MBCFS−ƥ)Fƥ⊕v(MBCFS−ɋ)Fɋ))1/ŋ2−ŋ=(1−(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(ΥMBCFS−ƥRP)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))u×(1−(ΥMBCFS−ɋRP)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))v)))1/ŋ2−ŋ)1/u+v+i(1−(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(ΥMBCFS−ƥIP)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))u×(1−(ΥMBCFS−ɋIP)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1))v)))1/ŋ2−ŋ)1/u+v),−|−1+(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((−|−1+(1+ΥMBCFS−ƥRN)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)|u×(−|−1+(1+ΥMBCFS−ɋRN)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)|v)))))1/ŋ2−ŋ|1/u+v+i(−|−1+(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((−|−1+(1+ΥMBCFS−ƥIN)ŋ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)|u×(−|−1+(1+ΥMBCFS−ɋIN)ŋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋ(Ⱦ(MBCFS−l)+1)|v)))))1/ŋ2−ŋ|1/u+v))=BCFPGBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ).
The BCFPGBM operator holds the following axioms.
1) Idempotency: Let MBCFS−ƥ=MBCFS=(ΥMBCFSP,ΥMBCFSN)=(ΥMBCFSRP+iΥMBCFSIP,ΥMBCFSRN+iΥMBCFSIN),ƥ=1,2,..,ŋ. Then,
BCFPGBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=MBCFS.
2) Commutativity: Let MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ have the permutation MBCFS−ƥ′=(ΥMBCFS−ƥ′P,ΥMBCFS−ƥ′N)=(ΥMBCFS−ƥ′RP+iΥMBCFS−ƥ′IP,ΥMBCFS−ƥ′RN+iΥMBCFS−ƥ′IN),ƥ=ƥ,2,…,ŋ. Then,
3) Boundedness: Let a group of BCFNs MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ and let MBCFS−=(minƥ{ΥMBCFS−ƥRP}+iminƥ{ΥMBCFS−ƥIP},maxƥ{ΥMBCFS−ƥRN}+imaxƥ{ΥMBCFS−ƥIN}) and MBCFS+=(maxƥ{ΥMBCFS−ƥRP}+imaxƥ{ΥMBCFS−ƥIP},minƥ{ΥMBCFS−ƥRN}+iminƥ{ΥMBCFS−ƥIN}). Then,
Take a group of BCFNs MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ, then the BCFWPGBM operator is inspected asBCFWPGBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=1u+v(∏ƥ=1,ɋ=1ƥ≠ɋŋ(u(MBCFS−ƥ)ŋwv−ƥ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1)⊕v(MBCFS−ɋ)ŋwv−ɋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1)))1/ŋ2−ŋ,where u,v>0 and Ⱦ(MBCFS−ƥ)=∑ɋ=1ɋ≠ƥŋSup(MBCFS−ƥ,MBCFS−ɋ), and wv=(wv−1,wv−2,…,wv−ŋ) is the weight vector (WV) with the property that wv−ƥ∈[0,1] and ∑ƥ=1ŋwv−ƥ=1.
The aggregated outcome from Eq. 16 based on the group of BCFNs MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ is a BCFN and is inspected asBCFWPGBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=(1−(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(ΥMBCFS−ƥRP)ŋwv−ƥ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1))u×(1−(ΥMBCFS−ɋRP)ŋwv−ɋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1))v)))1/ŋ2−ŋ)1/u+v+i(1−(1−(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((1−(ΥMBCFS−ƥIP)ŋwv−ƥ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1))u×(1−(ΥMBCFS−ɋIP)ŋwv−ɋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1))v)))1/ŋ2−ŋ)1/u+v),−|−1+(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((−|−1+(1+ΥMBCFS−ƥRN)ŋwv−ƥ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1)|u×(−|−1+(1+ΥMBCFS−ɋRN)ŋwv−ɋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1)|v)))))1/ŋ2−ŋ|1/u+v+i(−|−1+(∏ƥ=1,ɋ=1ƥ≠ɋŋ(1−((−|−1+(1+ΥMBCFS−ƥIN)ŋwv−ƥ(Ⱦ(MBCFS−ƥ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1)|u×(−|−1+(1+ΥMBCFS−ɋIN)ŋwv−ɋ(Ⱦ(MBCFS−ɋ)+1)∑l=1ŋwv−l(Ⱦ(MBCFS−l)+1)|v)))))1/ŋ2−ŋ|1/u+v)).
The BCFWPGBM operator holds these axioms:
1) Idempotency: Let MBCFS−ƥ=MBCFS=(ΥMBCFSP,ΥMBCFSN)=(ΥMBCFSRP+iΥMBCFSIP,ΥMBCFSRN+iΥMBCFSIN),ƥ=1,2,..,ŋ. Then,
BCFWPGBMu,v(MBCFS−1,MBCFS−2,…,MBCFS−ŋ)=MBCFS.
2) Commutativity: Let MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ have the permutation MBCFS−ƥ′=(ΥMBCFS−ƥ′P,ΥMBCFS−ƥ′N)=(ΥMBCFS−ƥ′RP+iΥMBCFS−ƥ′IP,ΥMBCFS−ƥ′RN+iΥMBCFS−ƥ′IN),ƥ=ƥ,2,…,ŋ. Then,
3) Boundedness: Let a group of BCFNs MBCFS−ƥ=(ΥMBCFS−ƥP,ΥMBCFS−ƥN)=(ΥMBCFS−ƥRP+iΥMBCFS−ƥIP,ΥMBCFS−ƥRN+iΥMBCFS−ƥIN),ƥ=ƥ,2,…,ŋ and let MBCFS−=(minƥ{ΥMBCFS−ƥRP}+iminƥ{ΥMBCFS−ƥIP},maxƥ{ΥMBCFS−ƥRN}+imaxƥ{ΥMBCFS−ƥIN}) and MBCFS+=(maxƥ{ΥMBCFS−ƥRP}+imaxƥ{ΥMBCFS−ƥIP},minƥ{ΥMBCFS−ƥRN}+iminƥ{ΥMBCFS−ƥIN}). Then,
In the aforementioned sections, we reviewed pollution and its types and introduced PBM operators based on the BCFS. Thus, here, we would study pollution and its types through introduced operators. As we know that pollution is a worldwide issue, big cities generally have more pollution than small cities or towns. Pollution can easily expand to those areas where no one lives. For instance, some chemicals and pesticides are observed in the Antarctic ice sheet. In the northern Pacific Ocean, a tremendous assortment of tiny plastic particle structures is called the Great Pacific Garbage Patch. Winds can carry radioactive material, inadvertently let out of an atomic reactor, and spread it over the planet. Water and air convey pollutants. Sea flows and migrating fish convey marine toxins all over. Pollution is of four major types, i.e., 1. air pollution, 2. water pollution, 3. soil pollution, and 4. noise pollution, and the causes of every type are different. Every type of pollution has a different effect on the environment. To find out the most harmful type of pollution for the environment is a DM issue. Thus, we would display how we can employ the introduced operators for the BCFS to solve this DM issue.
To employ the introduced operators for the BCFS to solve the DM issue, we define a DM procedure as follows based on the introduced operators in the environment of the BCFS.
Taking ŋ alternatives, i.e., MBCFS−1,MBCFS−2,…,MBCFS−ŋ and m attributes Ab−1,Ab−2,…,Ab−m with WV wv=(wv−1,wv−2,…,wv−m) with a property that wv−ɋ∈[0,1] and ∑ɋ=1mwv−ɋ=1, assume that the decision analyst or expert described his/her opinion in the model of BCFS and structured a decision matrix involving BCFNs that is MBCFS=(ΥMBCFSP,ΥMBCFSN)=(ΥMBCFSRP+iΥMBCFSIP,ΥMBCFSRN+iΥMBCFSIN), where ΥMBCFSRP,ΥMBCFSIP∈[0,1] and ΥMBCFSRN,ΥMBCFSIN∈[−1,0]. The steps for DM are as follows:
Step 1: In genuine life issues, the information or data can be cost or benefit. Benefits do not require normalization, but costs do:NBCFS={(ΥMBCFSP,ΥMBCFSN)forbenefit,(ΥMBCFSP,ΥMBCFSN)cforcost,where (ΥMBCFSP,ΥMBCFSN)c=(ΥMBCFSRP+iΥMBCFSIP,ΥMBCFSRN+iΥMBCFSIN)c=(1−ΥMBCFSRP+i(1−ΥMBCFSIP),−1−ΥMBCFSRN+i(−1−ΥMBCFSIN)).
Step 2: After completing step 1, the aggregated values of given information or data are determined by employing any introduced operator (BCFPBM, BCFWPBM, BCFPGBM, and BCFWPGBM).
Step 3: After finding out the aggregated values, the SV of these aggregated values would be determined by employing Eq. 2, and if any two SVs are equal, then accuracy values (AVs) are determined by employing Eq. 3. Furthermore, the ranking would be made based on these SVs and AVs and would reach the best alternative.
In the following section, we solve a numerical example by employing the introduced operators and DM procedure based on the BCFS to address genuine life issues.
Numerical example
Suppose four types of pollution, i.e., MBCFS−1=Airpollutioŋ, MBCFS−2=Soilpollutioŋ, MBCFS−3=Noisepollutioŋ, and MBCFS−4=Waterpollutioŋ, are under consideration and four attributes of the environment, i.e., Ab−1=Lithosphere, Ab−2=hydroshphere, Ab−3=atmosphere, and Ab−4=biosphere,arealsoconsidered. The decision analyst or expert provides the values of the effects of these types of pollution on the environment (Table 1). Now, we determine the most harmful type of pollution. For this, we would follow the steps of the DM procedure.
Decision matrix containing BCFNs is provided by an expert.
Ab−1
Ab−2
Ab−3
Ab−4
MBCFS−1
(0.69+i0.18,−0.2−i0.93)
(0.82+i0.76,−0.28−i0.67)
(0.19+i0.18,−0.49−i054.)
(0.87+i0.37,−0.43−i0.61)
MBCFS−2
(0.57+i0.5,−0.29−i063.)
(0.83+i0.66,−0.38−i0.66)
(0.38+i0.71,−0.7−i0.56)
(0.88+i0.19,−0.44−i028.)
MBCFS−3
(0.29+i0.5,−0.10−i0.39)
(0.84+i0.56,−0.48−i0.65)
(0.6+i0.28,−0.8−i0.92)
(0.89+i0.57,−0.54−i0.72)
MBCFS−4
(0.9+i0.72,−0.3−i0.6)
(0.85+i0.46,−0.58−i0.64)
(0.6+i0.18,−0.5−i0.91)
(0.71+i0.61,−0.29−i0.5)
Step 1: In this example, we do not need to perform the first step.
Step 2: The aggregated values of data in Table 1 are determined by employing introduced BCFPBM, BCFWPBM, BCFPGBM, and BCFWPGBM operators, which are explored in Table 2.
Aggregated values of information are described in Table 1.
Method
MBCFS−1
MBCFS−2
MBCFS−3
MBCFS−4
BCFPBM
(0.544+i0.55,−0.177−i0.18)
(0.581+i0.392,−0.182−i0.171)
(0.606+i0.446,−0.185−i0.169)
(0.642+i0.413,−0.159−i0.186)
BCFWPBM
(0.359+i0.359,−0.187−i0.187)
(0.393+i0.232,−0.188−i0.185)
(0.417+i0.268,−0.184−i0.189)
(0.453+i0.245,−0.189−i0.181)
BCFPGBM
(0.442+i0.551,−0.549−i0.545)
(0.511+i0.381,−0.578−i0.443)
(0.548+i0.45,−0.619−i0.418)
(0.614+i0.416,−0.628−i0.35)
BCFWPGBM
(0.645+i0.713,−0.386−i0.352)
(0.71+i0.627,−0.408−i0.258)
(0.739+i0.627,−0.438−i0.241)
(0.785+i0.595,−0.444−i0.191)
Step 3: SVs of these aggregated values determined by employing Eq. 2 are presented in Table 3.
SVs of the aggregated values of Table 2 and their ranking.
Method
S(MBCFS−1)
S(MBCFS−2)
S(MBCFS−3)
S(MBCFS−4)
Ranking
BCFPBM
0.863
0.832
0.852
0.85
MBCFS−1>MBCFS−3
>MBCFS−4>MBCFS−2
BCFWPBM
0.773
0.749
0.765
0.767
MBCFS−1>MBCFS−4
>MBCFS−3>MBCFS−2
BCFPGBM
0.475
0.468
0.49
0.513
MBCFS−4>MBCFS−3
>MBCFS−1>MBCFS−2
BCFWPGBM
0.655
0.648
0.672
0.686
MBCFS−4>MBCFS−3
>MBCFS−1>MBCFS−2
The rankings in Table 3 show that according to the introduced BCFPBM and BCFWPBM, MBCFS−1=Airpollutioŋ has more effect on the environment than the others, and according to the introduced BCFPGBM and BCFWPGBM, MBCFS−4=Waterpollutioŋ has more effect on the environment than the others.
Comparison
The introduced PBM operators (BCFPBM, BCFWPBM, BCFPGBM, and BCFWPGBM) and a DM procedure in the environment of the BCFS are more effective than other prevailing operators. We now take prevailing theories, including the CF power and DM procedure defined by Hu et al. (2019), sin trigonometric AOs and the DM procedure in the environment of the BF set defined by Riaz et al. (2022), Hamacher AOs and the DM procedure in the environment of the BF set established by Wei et al. (2018), PBM AOs and the DM procedure in the setting of the interval-valued intuitionistic FS (IVIFS) introduced by Liu and Li (2017), and BM AOs and the DM procedure for the BCFS introduced by Mahmood et al. (2022b). We consider the data provided in Table 1 and aggregate it with the assistance of these prevailing theories and the operators and the DM procedure introduced in this article. The results are shown in Table 4.
SVs were determined by the method proposed in this study and from previous studies.
Method
S(MBCFS−1)
S(MBCFS−2)
S(MBCFS−3)
S(MBCFS−4)
Ranking
Hu et al. (2019)
Flopped
Flopped
Flopped
Flopped
Flopped
Riaz et al. (2022)
Flopped
Flopped
Flopped
Flopped
Flopped
Wei et al. Wei et al. (2018)
Flopped
Flopped
Flopped
Flopped
Flopped
Liu and Li (2017)
Flopped
Flopped
Flopped
Flopped
Flopped
BCFBWM (Mahmood et al., 2022b)
0.526
0.514
0.519
0.535
MBCFS−4>MBCFS−1
>MBCFS−3>MBCFS−2
BCFPBM
0.863
0.832
0.852
0.85
MBCFS−1>MBCFS−3
>MBCFS−4>MBCFS−2
BCFWPBM
0.773
0.749
0.765
0.767
MBCFS−1>MBCFS−4
>MBCFS−3>MBCFS−2
BCFPGBM
0.475
0.468
0.49
0.513
MBCFS−4>MBCFS−3
>MBCFS−1>MBCFS−2
BCFWPGBM
0.655
0.648
0.672
0.686
MBCFS−4>MBCFS−3
>MBCFS−1>MBCFS−2
The results indicate that existing theories, for example, Hu et al. (2019), Riaz et al. (2022), Wei et al. (2018), and Liu and Li (2017), cannot solve the DM issue because the data form the structure of the BCFS. Hu et al. (2019) can merely solve the data in the model of CFS and cannot tackle the negative aspects, while Riaz et al. (2022) and Wei et al. (2018) merely resolve the information in the setting of the BFS and cannot overcome the second dimension, and Liu and Li (2017) merely resolve the information in the model of IVIFS and cannot address the second dimension and negative aspects. Furthermore, the results show that BM AO (BCF Bonferroni mean AO) (Mahmood et al., 2022b) for the BCFS and the DM approach handle the data and give us the result that MBCFS−4 is the finest choice, but anyone can say that this decision or selection is biased and not fair because of the weight vector that the decision analyst provides to each attribute on his own choice, for example, in this case, we take the weight vector (0.08,0.06,0.06,0.8) and u=v=2. However, in the case of the proposed PBM AOs for BCFS and the DM approach, we can see that the corresponding BCFPBWM gives us that MBCFS−1 is the finest alternative. In the proposed work, the decision analyst cannot provide the weight vector by his/her own choice and has to find it out through the proper formula, and in this example, we used the distance formula presented by Mahmood and Ur Rehman (2022b) in the formula of finding out the weight vector. This shows the investigated AOs get better and fair outcomes than the old ones. The results also show that the introduced operators and the DM procedure are appropriate tools for addressing uncertain and vague information in the environment of the BCFS. Also, the introduced operators can reduce the setting of the FS (by overlooking the NSG and unreal parts in the PSG), BFS (by making the unreal parts in both the PSG and NSG equal to zero), and CFS (by overlooking the NSG). Thus, the introduced operators and the procedure are more robust than other prevailing operators and DM procedures.
Conclusion
In this article, we studied the effect of pollution and its types on the environment by employing the introduced PBM operators and the DM procedure in the setting of the BCFS. The procedure by which the water, land, air, or other components of the natural environment are made unsafe or dirty to use is known as pollution. Pollution occurs by introducing any sort of pollutant into the environment, but the pollutant need not be visible, for example, temperature, light, and sound can be taken as pollutants if introduced into the environment artificially. For this study, we introduced the PBM operator in the setting of the BCFS, which are BCFPBM, BCFWPBM, BCFPGBM, and BCFWPGBM operators. Furthermore, we defined a DM procedure based on these PBM operators in the setting of the BCF set. After that, we described a numerical example in which we took four types of pollution and determined which type of pollution is more harmful and dangerous to the environment. We found that air pollution is more harmful than others by utilizing BCFPBM and BCFWPBM operators, and water pollution is more harmful than others by utilizing BCFPGBM and BCFWPGBM operators. Moreover, we illustrated that the introduced PBM operators and a DM procedure in the environment of the BCFS are more effective and have a wide model and advantages than certain prevailing works. We also showed that the investigated PBM AOs and the DM procedure for the BCFS gave us better and fair results than the prevailing similar AOs and DM procedures. The investigated operators and the DM procedure for the BCFS have certain limitations as well like they cannot tackle the data in the structure of BCF soft sets, complex bipolar intuitionistic fuzzy sets, BCF linguistic sets, etc.
In the future, our goal would be to review various notions like the bipolar complex fuzzy soft set (SS) (Mahmood et al., 2022c), Pythagorean FS (Li et al., 2022), picture FS (Ullah, 2021), picture fuzzy SSs (Khan et al., 2019), T-spherical FS (Javed et al., 2022), complex bipolar intuitionistic FS (Jan et al., 2022), enhancing digital innovation for the sustainable transformation of manufacturing industry (Yin et al., 2022) and try to employ the introduced work in these notions.
Data availability statement
The original contributions presented in the study are included in the article/Supplementary Material; further inquiries can be directed to the corresponding author.
Author contributions
Conceptualization, XY, TM, and UU; methodology, XY, TM, and UU; software, XY, TM, and UU; formal analysis, XY, TM, and UU; investigation, XY, TM, and UU; writing—original draft, XY, TM, and UU; writing—review and editing, XY, TM, and UU.
Funding
This work is supported by the National Natural Science Foundation of China (61877014, 12271132) and the funds provided by the Department of Education of Guangdong Province (2022A1515011460, 2021ZDJS044, PNB2103, 2021B1212040015).
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors, and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
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