Hello all
There is a bug with the summation sign in mathed. Rather than descibe
it here I have included a short lyx file with a decription of how to
reproduce the problem.
In addition if you click on the letter 'o' on the text line at
the bottom "and you obtain" and with the cursor keys move to the
right you will find that the letter "n" in "obtain" is no longer
available.
Bruce
#This file was created by <root> Sat Mar 13 10:30:51 1999
#LyX 1.0 (C) 1995-1999 Matthias Ettrich and the LyX Team
\lyxformat 2.15
\textclass article
\language american
\inputencoding default
\fontscheme default
\graphics default
\paperfontsize default
\spacing single
\papersize letterpaper
\paperpackage a4
\use_geometry 1
\use_amsmath 0
\paperorientation portrait
\leftmargin 0.5in
\topmargin 0.5in
\rightmargin 0.5in
\bottommargin 0.5in
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\defskip medskip
\quotes_language english
\quotes_times 2
\papercolumns 1
\papersides 1
\paperpagestyle plain
\bullet 3
1
16
-1
\end_bullet
\layout Standard
In the math display below highlight
\begin_inset Formula \( \left( s_{k-1}\right) ^{2}z^{-1} \)
\end_inset
and paste it to the box on the right
\layout Standard
\begin_inset Formula
\begin{eqnarray*}
now\, (1-a)\sum _{0}^{\infty }\left( s_{k-1}\right) ^{2}z^{-1} & = &
\end{eqnarray*}
\end_inset
\layout Standard
and you will obtain.
(note that the brackets are
\begin_inset Quotes eld
\end_inset
math-delim ( )
\begin_inset Quotes erd
\end_inset
)
\layout Standard
\begin_inset Formula
\begin{eqnarray*}
now\, (1-a)\sum _{0}^{\infty }\left( s_{k-1}\right) ^{2}z^{-1} & = & _{0}^{\infty
}\left( s_{k-1}\right) ^{2}z^{-1}
\end{eqnarray*}
\end_inset
\layout Standard
Start to the right of
\begin_inset Formula \( z^{-1} \)
\end_inset
(on the left hand side) and backspace and backspace until the summation
sign is deleted
\layout Standard
Likewise with the right hand side until only the infinity sign is left.
In both cases the infinity sign somehow gets shifted
\layout Standard
to the right of the cursor
\layout Standard
\begin_inset Formula
\begin{eqnarray*}
now\, (1-a)\sum _{0}^{\infty }\left( s_{k-1}\right) ^{2}z^{-1} & = & _{0}^{\infty
}\left( s_{k-1}\right) ^{2}z^{-1}
\end{eqnarray*}
\end_inset
\layout Standard
and you obtain
\begin_inset Formula
\begin{eqnarray*}
now\, (1-a)^{\infty } & = & ^{\infty }
\end{eqnarray*}
\end_inset
\the_end
