Given a hermititan matrix $A$ with the possibility to generate $e^{-iAt}$ for $t\geq 0$ how would I proceed to approxiamte:
$A^{-1}\approx\sum_j\alpha_je^{-iAt_j}$ $\quad$ with $\alpha_j\in\mathbb{C}$
How could I determine $\alpha_j$ and $t_j$
2026-03-26 22:13:23.1774563203
Approximate matrix inverse by Fourier approach
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