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<head><title>common sources of
problems</title>
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<h3 class="SubSectionHead"><a
name="QQ1-4-9"></a>Some Sources of Problems for MathML</h3>
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</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}...\mathrel( ... & ...\mathrel)...\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>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>’. </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.)
</li></ol>
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