AUTHOR=Conti Francesco , Frosini Patrizio , Quercioli Nicola TITLE=On the Construction of Group Equivariant Non-Expansive Operators via Permutants and Symmetric Functions JOURNAL=Frontiers in Artificial Intelligence VOLUME=Volume 5 - 2022 YEAR=2022 URL=https://www.frontiersin.org/journals/artificial-intelligence/articles/10.3389/frai.2022.786091 DOI=10.3389/frai.2022.786091 ISSN=2624-8212 ABSTRACT=Group equivariant operators are a fundamental tool in the research on neural networks. In this paper we introduce and explore the concept of Group Equivariant Non-Expansive Operator (GENEO) associated with a symmetric function, making available a new method for the construction of non-linear GENEOs.