<div style="padding:40px;color:#cbccc6"><h1>矩形膜本征模 (m, n)</h1><p>与 helmholtz-2d 类似但纵横比可调。</p><div style="padding:20px;background:#0d1017;border-left:3px solid #ffb454"><span class="katex-display"><span class="katex"><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mop">sin</span><span class="mopen">(</span><span class="mord mathnormal" style="margin-right:0.0359em;">mπ</span><span class="mord mathnormal">x</span><span class="mord">/</span><span class="mord mathnormal">a</span><span class="mclose">)</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mop">sin</span><span class="mopen">(</span><span class="mord mathnormal" style="margin-right:0.0359em;">nπ</span><span class="mord mathnormal" style="margin-right:0.0359em;">y</span><span class="mord">/</span><span class="mord mathnormal">b</span><span class="mclose">)</span></span></span></span></span></div><p style="color:#707a8c">该页面需要 JavaScript 进行交互式可视化。</p></div>