$n$-fold obstinate and $n$-fold fantastic (pre)filters of $EQ$-algebras

Document Type : Research Paper

Authors

Department of Mathematics, University of Bojnord, Bojnord, Iran

Abstract

In this paper, the notions of $n$-fold obstinate and $n$-fold fantastic (pre)filter
in $EQ$-algebras are introduced and the relationship among $n$-fold obstinate, maximal, $n$-fold fantastic, and $n$-fold (positive) implicative prefilters are investigated. Moreover, the quotient $EQ$-algebra induced by an $n$-fold obstinate filter is studied and it is proved that the quotient $EQ$-algebra induced by
an $n$-fold fantastic filter of a good $EQ$-algebra with bottom element $0$ is an involutive $EQ$-algebra. Finally, the relationships between types of $n$-fold filters in residuated $EQ$-algebras is shown by diagrams

Keywords