English
The projection map from the Icc x y interval to the real line is ContMDiff when viewed as a map on tangent spaces.
Русский
Проекция из отрезка Icc x y в вещественную ось гладка в смысле ContMDiff.
LaTeX
$$$\ContMDiff (\text{modelWithCornersSelf Real Real}) 1 (\mathrm{Subtype.val} )$ on $Icc x y$$$
Lean4
theorem oneTangentSpaceIcc_def : eta_helper Eq✝ @oneTangentSpaceIcc.{} @(delta% @definition✝) :=
by
intros
delta oneTangentSpaceIcc
rw [show wrapped✝ = ⟨@definition✝.{}, rfl✝⟩ from Subtype.ext✝ wrapped✝.2.symm✝]
rfl