is heading">#</a></h3>
<section id="bloch-pw-basis-plane-wave-pw-basis">
<h4><code class="code docutils literal notranslate"><span class="pre">bloch/PW_basis</span></code>: Plane Wave (PW) basis<a class="headerlink" href="#bloch-pw-basis-plane-wave-pw-basis" title="Link to this heading">#</a></h4>
<p><strong>Equations</strong></p>
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\[u_{i, \mathbf{k}, s}(\mathbf{x}) = \sum_{\mathbf{G}} \, e^{i \mathbf{G} \cdot \mathbf{x}