English
The ring Ring.Perfection R p is perfect of characteristic p; that is, it has bijective Frobenius.
Русский
Кольцо Ring.Perfection R p является совершенным кольцом характерности p, т.е. у него биективный Фробениус.
LaTeX
$$PerfectRing (Ring.Perfection R p) p$$
Lean4
instance perfectRing : PerfectRing (Ring.Perfection R p) p where
bijective_frobenius :=
Function.bijective_iff_has_inverse.mpr
⟨pthRoot R p, DFunLike.congr_fun <| @frobenius_pthRoot R _ p _ _,
DFunLike.congr_fun <| @pthRoot_frobenius R _ p _ _⟩