theorem :: EUCLID_2:37  :: Schwartz
  for x,y being Element of REAL n holds |.|(x,y)|.| <= |.x.|*|.y.|
proof
  let x,y be Element of REAL n;
  len x = n & len y = n by CARD_1:def 7;
  hence thesis by EUCLID_2:15;
end;
