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      <text>2.3.17 (Natural Domain)</text>
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      <text><![CDATA[<h3>Natural domain</h3>

<p>Note that in order to fully describe a function we need both the function rule <i>and</i> a domain. For example, we can specify \(f(x)=x^2\) for \(x\geq 0\). If a domain is not specified, we use the <b>natural domain</b> which is the largest part of the real numbers \(\mathbb{R}\) for which \(f(x)\) is defined. For example the natural domain for \(x^2\) is \(\mathbb{R}\) and the natural domain for \(\frac{1}{x}\) is \(x \not=0\).</p>]]></text>
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