Of, pertaining to, or constructed using equations(adjective)
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Use "equational" in a sentence
"The longer he considered them, the faster he was able to gather useful information: gaps in time, how missing components from his inbuilt equational field could be compensated for; he was, in other words, able to think abstractly."
"Thus his calculus of relations became the study of a certain equational theory which he noted had the same relation to the study of all binary relations on sets as the equational theory of Boolean algebra had to the study of all subsets of sets."
"By carrying out this analysis in the special setting of an algebra of predicates (or equivalently, in an algebra of classes) Jevons played an important role in the development of modern equational logic."