This coordinate representation of free vectors allows their algebraic features to be expressed in a convenient numerical fashion. For example, the sum of the two (free) vectors (1, 2, 3) and (−2, 0, 4) is the (free) vector ( 1 , 2 , 3 ) + ( − − 2 , 0 , 4 ) = ( 1 − − 2 , 2 + 0 , 3 + 4 ) = ( − − 1 , 2 , 7 ) .