Isabelle Larivière, Benoît Larose, David E. Pazmiño Pullas
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Abstract
A reflexive cycle is any reflexive digraph whose underlying undirected graph is a cycle. Call a relational structure Słupecki if its surjective polymorphisms are all essentially unary. We prove that all reflexive cycles of girth at least 4 have this property.
期刊介绍：
Algebra Universalis publishes papers in universal algebra, lattice theory, and related fields. In a pragmatic way, one could define the areas of interest of the journal as the union of the areas of interest of the members of the Editorial Board. In addition to research papers, we are also interested in publishing high quality survey articles.
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