greatest lower bound
<theory> (glb, meet, infimum) The greatest lower bound of two elements, a
and b is an element c such that c <= a and c <= b and if there is any other
lower bound c' then c' <= c.
The greatest lower bound of a set S is the greatest element b such that for all
s in S, b <= s. The glb of mutually comparable elements is their minimum but in
the presence of incomparable elements, if the glb exists, it will be some other
element less than all of them.
glb is the dual to least upper bound.
(In LaTeX "<=" is written as \sqsubseteq, the glb of two elements a and b is
written as a \sqcap b and the glb of set S as \bigsqcap S).
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