Infimum and supremum - Wikipedia
https://en.wikipedia.org/wiki/Infimum_and_supremum
WEBIn mathematics, the infimum (abbreviated inf; plural infima) of a subset of a partially ordered set is the greatest element in that is less than or equal to each element of if such an element exists. [1] . If the infimum of exists, it is unique, and if b is a lower bound of , then b is less than or equal to the infimum of .
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