 Modified Bessel differential equation (source code)

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= Modified Bessel differential equation
{c}
{title2=$z^2w''+zw'-(z^2+\nu^2)w=0$}

The <differential equation> defining <modified Bessel functions> of order $\nu$. For real fixed $\nu$ and positive $z$, its independent standard solutions are $I_\nu(z)$ and $K_\nu(z)$.

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