Wykaz ...: Wykaz ze jezeli u = [a₁ , a₂], v = [b₁ , b₂] i u = kv, to a₁b₂ − a₂b₁ = 0

Janek191: → → u = [ a₁, a₂] v = [ b₁ , b₂ ] oraz a₁ = k b₁ a₂ = k b₂ więc a₁ b₂ − a₂ b₁ = k b₁ b₂ − k b₂ b₁ = 0

...: dziekuje