1) Basic concept in set theory
Found on
https://www.crosswordclues.com/clue/disjoint-union
[topology] In general topology and related areas of mathematics, the disjoint union (also called the direct sum, free union, free sum, topological sum, or coproduct) of a family of topological spaces is a space formed by equipping the disjoint union of the underlying sets with a natural topology called the disjoint union topology. Roughly s...
Found on
http://en.wikipedia.org/wiki/Disjoint_union_(topology)
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