English
Soundness of the R-structure under iteration of Frobenius in the PerfectClosure context, formalized by a commuting diagram.
Русский
Корректность структуры R при повторной итерации Frobenius в контексте PerfectClosure, закодированная диаграммой коммутирования.
LaTeX
$$Soundness relation for PerfectClosure.R$$
Lean4
theorem sound (m n : ℕ) (x y : K) (H : (frobenius K p)^[m] x = y) : mk K p (n, x) = mk K p (m + n, y) :=
by
subst H
induction m with
| zero => simp only [zero_add, iterate_zero_apply]
| succ m ih =>
rw [ih, Nat.succ_add, iterate_succ']
apply Quot.sound
apply R.intro