A+b+c+d= 0 a b example : if w, = a-b+c-d=0 and a a a,b er a+b a+3b 3a+b+3c +d= 0 subspaces of m, (r), then dimw dimw, dim wnw, dimla/- 4-rank (a) (1) (2) (3) (4

a+b+c+d= 0 a b Example : If W, = a-b+c-d=0 and a a a,b ER a+b a+3b 3a+b+3c +d= 0 subspaces of M, (R), then dimW dimW, dim WnW, dimlA/- 4-Rank (A) (1) (2) (3) (4) dim W, + W down