sses</span>
<span class="c1"># ksC is k_σ sₘₐₓ C</span>
<span class="n">ksC</span><span class="p">,</span> <span class="n">phalf</span><span class="p">,</span> <span class="n">p</span> <span class="o">=</span> <span class="n">sp</span><span class="o">.</span><span class="n">symbols</span><span class="p">(</span><span class="s2">&quot;ksC phalf p&quot;</span><span class="p">,</span> <span class="n">real</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="n">