>=</span> <span class="mi">1</span><span class="o">/</span><span class="p">(</span><span class="mi">1</span> <span class="o">+</span> <span class="p">(</span><span class="n">radius</span> <span class="o">-</span> <span class="n">norm_to_center</span><span class="p">)</span><span class="o">.</span><span class="n">abs_</span><span class="p">())</span><span class="o">.</span><span class="n">pow_</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">exponent</span><sp