$H = DAAD$, where $D$ is a diagonal matrix and the elements on the diagonal are real numbers (could be positive and negative). $A$ is positive semi-definite and can be diagonalized into $A=U^T\Lambda U$. Then we can convert $H=DU^T\Lambda^2UD$. I am wondering how to estimate the upper bound of the largest eigenvalue of $H$. Please help! Thanks in advance.
2026-04-01 11:58:01.1775044681
Upper bound of the largest eigenvalue of $DAAD$.
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