<!-- real; modified_bessel_second_kind; (int v, real z); -->
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<p><code>real</code> <strong><code>modified_bessel_second_kind</code></strong><code>(int v, real z)</code><br>
Return the modified Bessel function of the second kind with order v
applied to z defined for positive z and v. <span class="math display">\[
\mathrm{modified\_bessel\_second\_kind}(v,z) = \begin{cases} K_v(z) &amp;
\text{if } z &gt; 0 \\ \textrm{error} &amp; \text{if } z \leq 0 \end{cases}
\]</span> where <span class="math display