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math.GR2022★ 2 cited
Abelianness and centrality in inverse semigroups
Michael Kinyon, David Stanovský
We adapt the abstract concepts of abelianness and centrality of universal algebra to the context of inverse semigroups. We characterize abelian and central congruences in terms of…
math.GR2022
Varieties of Lazy Magmas Characterized by Forbidden Substructure Theorems
João Araújo, Fernando Maia Ferreira, Michael Kinyon
A magma (or groupoid) is a set with a binary operation . Roughly speaking, a magma is said to be lazy if compositions such as depend on at most two variab…