Given $X \in \mathbb{R}^{N \times N}$, $a,b \in \mathbb{R}^N$
What is the relationship between $||a-b||_2$ and $a^TXa-b^TXb$?
2026-03-02 05:19:58.1772428798
Given a p.s.d. matrix $X$ and vectors $a, b$, what is the relationship between $||a-b||_2$ and $a^TXa-b^TXb$?
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