Abstract

There are five equivalence relations known as Green's relations definable on any semigroup or monoid, that is, on any algebra with a binary operation which is associative. In this paper, we examine whether Green's relations can be defined on algebras of any typeτ. Some sort of (super-)associativity is needed for such definitions to work, and we consider algebras which are clones of terms of typeτ, where the clone axioms including superassociativity hold. This allows us to define for any varietyVof typeτtwo Green's-like relationsℒVandℛVon the term clone of typeτ. We prove a number of properties of these two relations, and describe their behaviour whenVis a variety of semigroups.

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