Theorem Monoid.CoprodI.lift_injective_of_ping_pong

Modification history

2023-07-31 14:06
Mathlib/GroupTheory/CoprodI.lean
refactor: rename `FreeProduct` to `Monoid.CoprodI` (#6055)
Added Monoid.CoprodI.lift_injective_of_ping_pongView on Github →