كانت A equals open parentheses table row cell 1 space space end cell 3 row cell 2 space space end cell 0 end table close parentheses space space comma space space B equals open parentheses table row cell 1 space space end cell 2 row cell negative 1 space space end cell 0 end table close parentheses فان A cross times B equals
open parentheses table row cell negative 1 space space space end cell 2 row 1 3 end table close parentheses
open parentheses table row cell negative 2 space space space end cell 2 row 2 4 end table close parentheses
open parentheses table row cell 1 space space space end cell 2 row 3 4 end table close parentheses
right to left empty set