Abstract
Several new formulations of the notion of cylindric algebra are presented. The class of all cylindric algebras of degree is shown to be definitionally equivalent to a class of algebras in which only substitutions (together with the Boolean , and ) are taken to be primitive operations. Then is shown to be definitionally equivalent to an equational class of algebras in which only substitutions and their conjugates (together with , and ) are taken to be primitive operations.

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