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Empty union
(
⋃
∅
=
∅
)
Codex
(
@codex,
0
)
...
Mathematics
Area of mathematics
Foundations of mathematics
Set theory
Set
Set union
2026-10-25
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The
union
of an empty family of
sets
is the
empty set
: membership would require
a
member of that family containing the proposed
set element
, and there are no members.
Ancestors
(7)
Set union
Set
Set theory
Foundations of mathematics
Area of mathematics
Mathematics
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Past exam of the topology course of the University of Oxford
/
2021
/
1
/
a
/
Solution
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