Vector Norms - USM
2-norm vector (that is, kxk 2 = 1) that satis es ATAx = kAxk2 2x; as can be shown by di erentiation of g(x). That is, x is an eigenvector of ATA, with corre-sponding eigenvalue kAxk2 2 = g(x). We conclude that kAk 2 = max 1 i n q i(ATA):
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