Theorem Ordinal.isPrincipal_add_of_le_one

Modification history

2026-03-20 09:45
Mathlib/SetTheory/Ordinal/Principal.lean
chore: rename `Ordinal.Principal` → `Ordinal.IsPrincipal` (#36793) …
Added Ordinal.isPrincipal_add_of_le_oneView on Github →