This monograph introduces and explores the notions of a commutator
equation and the equationally-defined commutator from the perspective of
abstract algebraic logic. An account of the commutator operation
associated with equational deductive systems is presented, with an
emphasis placed on logical aspects of the commutator for equational
systems determined by quasivarieties of algebras. The author discusses
the general properties of the equationally-defined commutator, various
centralization relations for relative congruences, the additivity and
correspondence properties of the equationally-defined commutator and its
behavior in finitely generated quasivarieties.
Presenting new and original research not yet considered in the
mathematical literature, The Equationally-Defined Commutator will be
of interest to professional algebraists and logicians, as well as
graduate students and other researchers interested in problems of modern
algebraic logic.