English
A curryFinFinset with constant arguments reproduces the original map on the piecewise input: curryFinFinset hk hl f (const x) (const y) = f(s.piecewise(const x) const y).
Русский
КарриFinFinset с константами возвращает исходную карту на склеенном входе через piecewise.
LaTeX
$$$\\curryFinFinset\\,\\mathbb{R}\\ G\\ G' hk hl\\ f\\ (\\lambda _ => x)\\ (\\lambda _ => y) = f\\big( s\\.piecewise(\\lambda _ => x) (\\lambda _ => y) \\big).$$$
Lean4
theorem curryFinFinset_apply_const (hk : #s = k) (hl : #sᶜ = l) (f : G [×n]→L[𝕜] G') (x y : G) :
(curryFinFinset 𝕜 G G' hk hl f (fun _ => x) fun _ => y) = f (s.piecewise (fun _ => x) fun _ => y) :=
by
refine (curryFinFinset_symm_apply_piecewise_const hk hl _ _ _).symm.trans ?_
rw [LinearIsometryEquiv.symm_apply_apply]