Modified Bessel function, third kind, integer order.
| double | K (double x, int v)
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Modified Bessel function of the third kind, with zero order.
| double | K0 (double x)
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| double | K0_exp (double x)
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Modified Bessel function, third kind, order one.
| double | K1 (double x)
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| double | K1_exp (double x)
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