me as <tt>latex</tt>.<br />
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At this point the most likely cause of a semantic error is
the order of operations. For example, to evaluate 1/2 <font face="symbol">p</font>,
you might be tempted to write
</font><pre><font size="4" color="blue">
&gt;&gt;&gt; 1.0 / 2.0 * pi
</font></pre><font color="black">But the division happens first, so you would get <font face="symbol">p</font> / 2, which
is not the same thin