اذا كانت A equals open parentheses table row 1 row 3 row cell negative 1 end cell end table close parentheses space space comma space space B equals open parentheses table row cell 2 space space space end cell cell 1 space space space end cell 0 end table close parentheses فان B cross times A equals
right to left empty set
open parentheses table row 2 row 3 row 0 end table close parentheses
open parentheses space 5 space close parentheses
open parentheses table row cell 2 space space space end cell cell 3 space space space end cell 0 end table close parentheses
