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Theorems · Theorem · logic and foundations

Ordinal.cof_eq_of_isNormal

Deprecated since 2026-03-19Use Ordinal.cof_map_of_isNormal instead.

∀ {f : Ordinal.{u_1} → Ordinal.{u_1}}, Order.IsNormal f → ∀ {a : Ordinal.{u_1}}, Order.IsSuccLimit a → (f a).cof = a.cof

Alias of Ordinal.cof_map_of_isNormal.

Defined in
Mathlib.SetTheory.Cardinal.Cofinality.Ordinal
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Foundations
Depth 91 from the axioms · uses propext, Classical.choice, Quot.sound
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Cardinal · cited by 2598CardinalOrdinal · cited by 1688OrdinalOrder.IsSuccLimit · cited by 255Order.IsSuccLimitOrdinal.cof · cited by 125Ordinal.cofOrder.IsNormal · cited by 118Order.IsNormalOrdinal.cof_map_of_isNormal · cited by 7Ordinal.cof_map_of_isNorm…Ordinal.cof_eq_of_isNormalCITED BYCITES

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