Ordinal.exists_lt_add_of_not_principal_add

∀ {a : Ordinal.{u}}, ¬Ordinal.IsPrincipal (fun x1 x2 => x1 + x2) a → ∃ b < a, ∃ c < a, b + c = a

Alias of Ordinal.exists_lt_add_of_not_isPrincipal_add.

Defined in: Mathlib.SetTheory.Ordinal.Principal
Cited by: 0 results in Mathlib
Foundations: Depth 41 from the axioms · uses propext, Classical.choice, Quot.sound

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