v_1 = (1, 2, 3, 4), v_2 = (4, 3, 2, 1), v_3 = (1, 3, 2, 4).
If you can find an orthogonal matrix A, A A^T = I so that
v_1 A = (u_11, u_12, u_13, 0)
v_2 A = (u_21, u_22, u_23, 0)
v_3 A = (u_31, u_32, u_33, 0),
then det(u_ij) = ?
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，你有摳摳ㄋㄟ
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