English
For V and V1, mpullbackWithin I I' f (V + V1) s x equals mpullbackWithin I I' f V s x plus mpullbackWithin I I' f V1 s x; similarly for scalar multiplies.
Русский
Для любых V и V1 выполняется линейность вытягивания: mpullbackWithin I I' f (V + V1) s x = mpullbackWithin I I' f V s x + mpullbackWithin I I' f V1 s x; также для скаляра.
LaTeX
$$$$ \mathrm{mpullbackWithin}\ I\ I'\ f\ (V + V1)\ s\ x = \mathrm{mpullbackWithin}\ I I' f V s x + \mathrm{mpullbackWithin}\ I I' f V1 s x $$$$
Lean4
theorem mpullback_neg_apply : mpullback I I' f (-V) x = -mpullback I I' f V x := by simp [mpullback_apply]