Ordinal.le_iff_deriv

∀ {f : Ordinal.{u} → Ordinal.{u}}, Order.IsNormal f → ∀ {a : Ordinal.{u}}, f a ≤ a ↔ ∃ o, Ordinal.deriv f o = a

Defined in: Mathlib.SetTheory.Ordinal.FixedPoint
Cited by: 1 results in Mathlib
Foundations: Depth 87 from the axioms · uses propext, Classical.choice, Quot.sound

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