In set theory, the disjoint union (or discriminated union... - dofaq.co
disjoint union

In set theory, the disjoint union (or discriminated union...

wikipedia - 29 Jul 2015
In set theory, the disjoint union (or discriminated union) of a family of sets is a modified union operation that indexes the elements according to which set they originated in. Or slightly different from this, the disjoint union of a family of subsets is the usual union of the subsets which are pairwise disjoint – disjoint sets means they have no element in common.

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