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      <text>6.3.3.1 Logs to base 10 and natural logs</text>
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      <text><![CDATA[<h3>Logs to base 10 and natural logs</h3>
<p>In practice only two kinds of logarithms are commonly used, those to base 10, written 
\(\log_{10}\) and those to base \(e\), written \(\log_{e}\) or more usually \(\ln\) or \(\log\) (called <b>natural logarithms</b>).</p>
<p>Most scientific calculators will determine the logarithm to base \(10\) and to base \(e\).</p>
<p>For example, \(\log_{10} 13=1.11394\) (implying \(10^{1.11394}=13\)), \(\log 23 =\ln 23=3.13549\) (implying 
\(e^{3.13549}=23\)).</p>]]></text>
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