ZFSet.IsOrdinal.subset_iff_eq_or_mem

∀ {x y : ZFSet.{u}}, x.IsOrdinal → y.IsOrdinal → (x ⊆ y ↔ x = y ∨ x ∈ y)

Defined in: Mathlib.SetTheory.ZFC.Ordinal
Cited by: 2 results in Mathlib
Foundations: Depth 30 from the axioms · uses propext, Classical.choice, Quot.sound

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