How do we solve
$\frac{d^2f}{dz^2} + \left(Az^2+Bz+C\right)f=0 \tag 1$
where $f(z),A,B,C$ are matrices of order $3 \times 3$.
2026-03-30 05:11:13.1774847473
ODE -parabolic cylinder functions
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