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Ordinal Rank Function
Ordinal Rank Function
Apr 16, 2026
1 min read
set-theory
rank
ordinal
ρ
(
x
)
=
sup
{
ρ
(
y
)
+
1
∣
y
∈
x
}
Measures complexity of set.
ρ
(
∅
)
=
0
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