Stuff for data.fin.vec_notation #
theorem
Function.update_cons_two
{α : Type u_1}
{i : ℕ}
{w x y z : α}
{t : Fin i → α}
:
update (Matrix.vecCons w (Matrix.vecCons x (Matrix.vecCons y t))) 2 z = Matrix.vecCons w (Matrix.vecCons x (Matrix.vecCons z t))