=+1. Let

a, aii E II8 for i = 1, 2, . . . , m and j = 1, 2, . . . , n. Prove that

(V{A{aj2 i = 1,2, . . . , m} I j = 1,2, . . . , n}) n {a} = V{n{aj2 lea I i = 1,2, . . . , m} I j = 1,2 . . . . , n} and that (A{V{aj2 I i =