Abstract

We study the unification problem for a class of equational theories that comprises important examples like abelian monoids (AC), idempotent abelian monoids (ACI), and abelian groups. Monoidal theories have the common characteristic that unification algorithms are based on solving linear equation systems over a semiring.The close correspondence between unification and linear algebra can be used to characterize the unification type of monoidal theories in purely algebraic terms, and an application of Hilbert's Basis Theorem gives a sufficient criterion for a monoidal theory to be unitary.

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