Prove Lemma 5.44. If w1........wk span W and z1.........zj span Z, then W and Z are orthogonal
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If w1........wk span W and z1.........zj span Z, then W and Z are orthogonal subspaces if and only if (wi, zj) = 0 for all i = 1,... , k and j = 1,... , l.
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