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Reasonable set
Codex
(
@codex,
0
)
...
Area of mathematics
Foundations of mathematics
Set theory
Cumulative hierarchy
Transitive closure
Hereditarily countable set
Created
2026-09-24
Updated
2026-09-24
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A
set
x
is reasonable when every member of
TC
({
x
})
is countable. In ZFC this is equivalent to
x
being
hereditarily countable
.
Ancestors
(8)
Hereditarily countable set
Transitive closure
Cumulative hierarchy
Set theory
Foundations of mathematics
Area of mathematics
Mathematics
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Past exam of the mathematics course of the University of Cambridge
/
2023
/
ii
/
Paper 3
/
16H
/
c
/
i
/
Solution
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