Theorem Ordinal.not_principal_iff_of_monotone

Modification history

2026-03-20 09:45
Mathlib/SetTheory/Ordinal/Principal.lean
chore: rename `Ordinal.Principal` → `Ordinal.IsPrincipal` (#36793) …
Deleted Ordinal.not_principal_iff_of_monotoneView on Github →
2024-11-14 06:25
Mathlib/SetTheory/Ordinal/Principal.lean
feat(SetTheory/Ordinal/Principal): `n + ω = ω` (#18902) …
Added Ordinal.not_principal_iff_of_monotoneView on Github →