# Disjoint union

From Maths

## Disambiguation

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**Disjoint union** may refer to:

- Disjoint union (set) - The coproduct construction, in the
*SET*category- Most - if not all - instances of the disjoint union involve the disjoint union of sets. For [ilmath](X_\alpha)_{\alpha\in I} [/ilmath] a family of sets, [ilmath]\coprod_{\alpha\in I}X_\alpha[/ilmath] is their disjoint union

- Disjoint union (topology) - topological construct, defining a topology on the disjoint union of the underlying set of a family of topological spaces