English
The function vecMul is additive in its first argument: vecMul(x + y, A) = vecMul(x, A) + vecMul(y, A).
Русский
vecMul по первому аргументу аддитивна: vecMul(x + y, A) = vecMul(x, A) + vecMul(y, A).
LaTeX
$$$\mathrm{vecMul}(x + y, A) = \mathrm{vecMul}(x, A) + \mathrm{vecMul}(y, A)$$$
Lean4
theorem add_vecMul [Fintype m] (A : Matrix m n α) (x y : m → α) : (x + y) ᵥ* A = x ᵥ* A + y ᵥ* A :=
by
ext
apply add_dotProduct