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relative pseudo-complement

n. (context mathematics English) The residual operation of a Heyting algebra when considered as a residuated lattice whose monoid operation is the meet operation. Equivalently, the ''relative pseudo-complement'' of ''a'' with respect to ''b'' is the supremum of the set of all ''z'' such that z wedge a leqslant b, where wedge denotes the meet operation of the given Heyting algebra.