Disjoint union

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