Polyadic algebra

Polyadic algebras (more recently called Halmos algebras[1]) are algebraic structures introduced by Paul Halmos.

They are related to first-order logic analogous to the relationship between Boolean algebras and propositional logic (see Lindenbaum–Tarski algebra).

There are other ways to relate first-order logic to algebra, including Tarski's cylindric algebras[1] (when equality is part of the logic) and Lawvere's functorial semantics (a categorical approach).

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