Are the following statements true or false? If x is not in a subspace W, then x - projW(x) is not zero. In a QR factorization, say A = QR (when A has linearly independent columns), the columns of Q form an orthonormal basis for the column space of A ? If W = Span{v1, v2, v3}, and if {v1, v2, v3} is an orthogonal set in W. then {v1, v2, v3} is an orthonormal basis for W.