On 04/11/2009, at 3:21 PM, Shigeharu TAKENO wrote:

I think this is not a question for latex2html but for LaTeX.

If you want the output such as the latter one for the first
source, you may do

\begin{equation}
  y=\textstyle\sum_{i=1}^n x_i
\end{equation}

A better way, perhaps, is:

\begin{equation}
  y=\sum\nolimits_{i=1}^n x_i
\end{equation}



If you want the output such as the first one for the latter
source, you may do

\begin{equation}
  y=\frac{1}{\displaystyle\sum_{i=1}^n x_i}
\end{equation}

 ... and similarly:

\begin{equation}
  y=\frac{1}{\sum\limits_{i=1}^n x_i}
\end{equation}

This way you do not have to worry about the scope
of the  \textstyle  or  \displaystyle  which can also
alter the size of the \sum symbol, and would affect any
fractions that follow afterwards, as well as other things.

Use of  \limits  and  \nolimits  is applicable to all
operators, including textual ones; e.g.
     \operatorname{Hom}



+========================================================+
 Shigeharu TAKENO     NIigata Institute of Technology
                       kashiwazaki,Niigata 945-1195 JAPAN
 [email protected]   TEL(&FAX): +81-257-22-8161
+========================================================+


Hope this helps,

        Ross

------------------------------------------------------------------------
Ross Moore                                       [email protected]
Mathematics Department                           office: E7A-419
Macquarie University                             tel: +61 (0)2 9850 8955
Sydney, Australia  2109                          fax: +61 (0)2 9850 8114
------------------------------------------------------------------------



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