Say we have two matrices $H$ and $J$, both of which are diagonalizable. Let $\lambda$ be some small parameter. What's the best method for diagonalizing the sum $H + \lambda J$, working perturbatively in $\lambda$? (say, to $O(\lambda^2)$)
2026-04-02 06:25:44.1775111144
Diagonalizing a matrix perturbatively
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