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      <text>25.1.2.4 Three PDEs of general interest</text>
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      <text><![CDATA[<div class="HELM_keypoint">
<h4>Key Point</h4>
<p>The three PDEs  of greatest general interest involving two independent variables are:</p>
<ol type="a">
<li>The two-dimensional Laplace equation \[\dfrac{\partial^2u}{\partial 
x^2}+\dfrac{\partial^2u}{\partial y^2}=0\] </li>
<li>The one-dimensional heat conduction equation: \[\dfrac{\partial^2u}{\partial x^2}=\dfrac{1}{k}\dfrac{\partial u}{\partial t}\] </li>
<li>The one-dimensional wave equation: \[\dfrac{\partial^2u}{\partial x^2}=\dfrac{1}{c^2}\dfrac{\partial^2u}{\partial t^2}\] </li>
</ol>
</div>]]></text>
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