English
Inversion preserves ContMDiffWithinAt under left-invariant derivations context.
Русский
Обращение сохраняет ContMDiffWithinAt в контексте левых инвариантных выводов.
LaTeX
$$ContMDiffWithinAt I' I n f s x0 → ContMDiffWithinAt I' I n (inv f) s x0$$
Lean4
@[to_additive]
theorem div {f g : M → G} {s : Set M} {x₀ : M} (hf : ContMDiffWithinAt I' I n f s x₀)
(hg : ContMDiffWithinAt I' I n g s x₀) : ContMDiffWithinAt I' I n (fun x => f x / g x) s x₀ := by
simp_rw [div_eq_mul_inv]; exact hf.mul hg.inv