ion-number">15.3.7</span> Adding on the log scale</h3>
<p>If we work on the log scale, multiplication is converted to addition,
<span class="math display">\[
\log (a \times b) = \log a + \log b.
\]</span>
Thus we can just start on the log scale and stay there through
multiplication. But what about addition? If we have <span class="math inline">\(\log a\)</span> and
<span class="math inline">\(\log b\)</span>, how do we get <span class="math inline">\(\log (a + b)\)</span>? Working out the algebra,</p>
<p><s