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      <text>20.1.1.3 Key point</text>
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    <questiontext format="html">
      <text><![CDATA[<p>The integral \(\int_0^\infty \text{e}^{-st}f(t)\,dt\) is called the Laplace transform of \(f(t)\) and is denoted by \({\cal L}\{f(t)\}.\)

</p><div class="HELM_keypoint">
    <h4>Key Point</h4>
    <p></p><center><strong>The Laplace Transform</strong></center><p></p>
    <p>\[{\cal L}\{f(t)\} \equiv \int_0^\infty \text{e}^{-st}f(t)\,dt = F(s)\]</p>
</div>]]></text>
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