Czelakowski, Janusz2019-03-142024-04-262019-03-142024-04-262015978-3-319-21200-5https://drs.ess.gov.et/handle/12345678/53728enEquational Logic and Algebra ;The Equationally-Defined CommutatorThe Equationally-Defined Commutator A Study in Equational Logic and AlgebrBook