English
Casting preserves the underlying function. The functions (γ.cast hx hy) and γ have the same evaluation on the unit interval: (γ.cast hx hy : I → X) = γ.
Русский
Приведение сохраняет основанную функцию: (γ.cast hx hy : I → X) = γ.
LaTeX
$$$(\gamma.cast hx hy : I \to X) = \gamma$$$
Lean4
@[simp]
theorem cast_coe (γ : Path x y) {x' y'} (hx : x' = x) (hy : y' = y) : (γ.cast hx hy : I → X) = γ :=
rfl