Bound

A bound of a set, function, etc. is a value which all members are less than (in the case of an upper bound) or greater than (in the case of a lower bound).

See also

Bound Variable, Bounded, Bounded from Above, Bounded from Below, Greatest Lower Bound, Infimum, Least Upper Bound, Supremum

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Weisstein, Eric W. "Bound." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Bound.html