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Delta-system lemma at a regular uncountable cardinal
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Mathematics
Area of mathematics
Foundations of mathematics
Set theory
Delta-system lemma
2026-10-03
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If
κ
is
a
regular uncountable
cardinal number
, every family of
κ
finite sets
has a
subfamily of
cardinality
κ
whose distinct members have one common pairwise intersection.
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Delta-system lemma
Set theory
Foundations of mathematics
Area of mathematics
Mathematics
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Finite-condition Lévy collapse
Past exam of the mathematics course of the University of Cambridge
/
2019
/
iii
/
Paper 121
/
3
/
v
/
b
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