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I was thinking of the problem differently - find the extremal points of xDx, which leads to the eigenvalue equation Dx = 0. This equation doesn't determine xx completely, so one is free to impose, for example, xx = 1 as a normalization condition. But you're right that if xx = 1 is intended as a true constraint, then a method like Lagrange multipliers should be used.

In reply to Re^3: Help with Matrix math! by randyk
in thread Help with Matrix math! by madslynge

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