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<head><title>common sources of
problems</title>
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<a
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<h3 class="SubSectionHead"><a
name="QQ1-4-9"></a>Some Sources of Problems for MathML</h3>
<!--l. 3051--><p class="noindent" >
</p><ol type="a" >
<li>Broken math formulas, such as ‘<span
class="cmtt-10">$R=\{x|x$ is real $\}$</span>’ instead of ‘<span
class="cmtt-10">$R=\{x|x \mbox{ is real } \}$</span>’.
</li>
<li>Math mode employment for presenting nonmath content, such as ‘<span
class="cmtt-10">$$\vbox{...}$$ </span>’ instead of
‘<span
class="cmtt-10">\begin{center}\vbox{...}\end{center}</span>’. </li>
<li>Unmatched parentheses within entries of arrays, such as ‘<span
class="cmtt-10">\begin{array}...(... & ...)...\end{array}</span>’ instead
of ‘<span
class="cmtt-10">\begin{array}...\left(\right. ... & ...\left.\right)...\end{array}</span>’. </li>
<li>Incorrect annotation of delimiters, such as ‘<span
class="cmtt-10">\bigl\{...\bigr|...\bigr\}</span>’ instead of ‘<span
class="cmtt-10">\bigl\{...\bigg|...\bigr\}</span>’
</li>
<li> <a
name="index4-9001"></a> <a
name="index4-9002"></a>Empty bases for subscripts and superscripts, such as ‘<span
class="cmtt-10">{}^{...}, {}_{...}</span>’ instead of ‘<span
class="cmtt-10">{\csname</span>
<span
class="cmtt-10">HCode\endcsname{}}^{...}, {\csname HCode\endcsname{}}_{...}</span>’.
<!--l. 3083--><p class="noindent" ></p></li>
<li>Missing grouping for bases of subscripts and suprscripts, such as ‘<span
class="cmtt-10">10^6</span>’ instead of ‘<span
class="cmtt-10">{10}^6</span>’.
<!--l. 3087--><p class="noindent" ></p></li>
<li>Missing grouping for subscripts and suprscripts, such as ‘<span
class="cmtt-10">A_\mathit{...}</span>’ instead of ‘<span
class="cmtt-10">A_{\mathit{...}}</span>’. (LaTeX
allows indirect access to the content of the operands; TeX4ht requires direct access.)
<!--l. 3094--><p class="noindent" ></p></li>
<li>Use of the operators ‘<span
class="cmtt-10">^</span>’ and ‘<span
class="cmtt-10">_</span>’, instead of ‘<span
class="cmtt-10">\sb</span>’ and ‘<span
class="cmtt-10">\sp</span>’, outside the presence of TeX4ht. (TeX4ht becomes active
only at the ‘<span
class="cmtt-10">\begin{document}</span>’ command. The ‘<span
class="cmtt-10">early_</span>’ and ‘<span
class="cmtt-10">early^</span>’ options extend this awareness to the
preambles of the source latex documents.)
<!--l. 3100--><p class="noindent" ></p></li>
<li>If math environments nested within tabular environments cause <a
href="mn5.html" name="mn5.html" >problems</a> enclose them within braces (for instance, ‘<span
class="cmtt-10">\begin{tabular}{c} \begin{minipage}{4in} {</span>
<span
class="cmtt-10">\begin{eqnarray} x & = & y \end{eqnarray} } \end{minipage} \end{tabular}</span>’).
</li></ol>
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