Noun
relative pseudo-complement (plural relative pseudo-complements)
(mathematics) 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
∧
a
⩽
b
{\displaystyle z\wedge a\leqslant b}
, where
∧
{\displaystyle \wedge }
denotes the meet operation of the given Heyting algebra.