A characterization of regular, intra-regular, left quasi-regular and semisimple hypersemigroups in terms of fuzzy sets

TL;DR

This paper characterizes various types of hypersemigroups, such as regular and intra-regular, using fuzzy set inequalities, providing useful theoretical tools for applications in algebraic structures.

Contribution

It introduces fuzzy set-based characterizations for regular, intra-regular, quasi-regular, and semisimple hypersemigroups, expanding the algebraic understanding of these structures.

Findings

Hypersemigroup regularity characterized by $f e f\circ 1\circ f$ for fuzzy sets.

Intra-regular hypersemigroups characterized by $f\re 1\circ f\circ f\circ 1$.

Semisimple hypersemigroups characterized by $f\re 1\circ f\circ 1\circ f\circ 1$.

Abstract

We prove that an hypersemigroup $H$ is regular if and only, for any fuzzy subset $f$ of $H$, we have $f\preceq f\circ 1\circ f$ and it is intra-regular if and only if, for any fuzzy subset $f$ of $H$, we have $f\preceq 1\circ f\circ f\circ 1$. An hypersemigroup $H$ is left (resp. right) quasi-regular if and only if, for any fuzzy subset $f$ of $S$ we have $f\preceq 1\circ f\circ 1\circ f$ (resp. $f\preceq f\circ 1\circ f\circ 1)$ and it is semisimple if and only if, for any fuzzy subset $f$ of $S$ we have $f\preceq 1\circ f\circ 1\circ f\circ 1$. The characterization of regular and intra-regular hypersemigroups in terms of fuzzy subsets are very useful for applications.