Theorem Ordinal.principal_add_iff_add_left_eq_self

Modification history

2026-03-20 09:45
Mathlib/SetTheory/Ordinal/Principal.lean
chore: rename `Ordinal.Principal` → `Ordinal.IsPrincipal` (#36793) …
Deleted Ordinal.principal_add_iff_add_left_eq_selfView on Github →
2024-11-12 10:47
Mathlib/SetTheory/Ordinal/Principal.lean
chore(SetTheory/Ordinal/Principal): use `variable` (#18898) …
Modified Ordinal.principal_add_iff_add_left_eq_selfView on Github →
2023-02-22 19:59
Mathlib/SetTheory/Ordinal/Principal.lean
feat: port SetTheory.Ordinal.Principal (#2442)
Added Ordinal.principal_add_iff_add_left_eq_selfView on Github →