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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
least upper bound
lub
supremum
(lub or "join", "supremum") The least upper bound of
two elements a and b is an upper bound c such that a <= c and
b <= c and if there is any other upper bound c' then c <= c'.
The least upper bound of a set S is the smallest b such that
for all s in S, s <= b. The lub of mutually comparable
elements is their maximum but in the presence of incomparable
elements, if the lub exists, it will be some other element
greater than all of them.
Lub is the dual to greatest lower bound.
(In LaTeX, "<=" is written as \sqsubseteq, the lub of two
elements a and b is written a \sqcup b, and the lub of set S
is written as \bigsqcup S).
(1995-02-03)