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Disjoint union
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Mathematics
Mathematical concepts
Basic concepts in set theory
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Disjoint union
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Created
2026-09-24
Updated
2026-09-24
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The
disjoint union
tags the elements of its summands, for example
X
⊔
Y
=
(
X
×
{
0
})
∪
(
Y
×
{
1
})
.
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