I should use 'AMS multiline'?
sure
And in the last example you get different sizes of the equations, also no error, but looks ugly.
Well, I just tried to use the multiline example on p.47 in your PDF-file, but I still get ugly parenthesis... would you mind creating a .lyx-file that get's the parenthesis right?
attached Herbert
#LyX 1.3 created this file. For more info see http://www.lyx.org/ \lyxformat 221 \textclass article \language english \inputencoding latin1 \fontscheme default \graphics default \paperfontsize 12 \spacing single \papersize Default \paperpackage a4 \use_geometry 0 \use_amsmath 1 \use_natbib 0 \use_numerical_citations 0 \paperorientation portrait \paperwidth 17cm \paperheight 22cm \leftmargin 1.2cm \topmargin 1.4cm \rightmargin 1.7cm \bottommargin 1.4cm \headsep 1cm \secnumdepth 4 \tocdepth 4 \paragraph_separation indent \defskip medskip \quotes_language german \quotes_times 1 \papercolumns 1 \papersides 2 \paperpagestyle default
\layout Standard
An example for the multine environment.
There is still a bug in LyX, which I reported long long time ago ...
:-(.
LyX shows (#) for every row, but the multline enviromnet has only a number
in the last line.
\layout Standard
\begin_inset Formula \begin{multline}
A=\lim_{n\rightarrow\infty}\Delta x\left(a^{2}+\left(a^{2}+2a\Delta x+\left(\Delta
x\right)^{2}\right)\right.\label{eq:reset}\\
+\left(a^{2}+2\cdot2a\Delta x+2^{2}\left(\Delta x\right)^{2}\right)\\
+\left(a^{2}+2\cdot3a\Delta x+3^{2}\left(\Delta x\right)^{2}\right)\\
+\ldots\\
\left.+\left(a^{2}+2\cdot(n-1)a\Delta x+(n-1)^{2}\left(\Delta
x\right)^{2}\right)\right)\\
=\frac{1}{3}\left(b^{3}-a^{3}\right)\end{multline}
\end_inset
\layout Standard
The second example shows a multline environment with pairs of parentheses
which are going over several lines:
\layout Standard
\begin_inset Formula \begin{multline}
\frac{1}{2}\Delta(f_{ij}f^{ij})=2\left(\sum_{i<j}\chi_{ij}(\sigma_{i}-\sigma_{j})^{2}+f^{ij}\nabla_{j}\nabla_{i}(\Delta
f)+\right.\\
\left.+\nabla_{k}f_{ij}\nabla^{k}f^{ij}+f^{ij}f^{k}\left[2\nabla_{i}R_{jk}-\nabla_{k}R_{ij}\right]\vphantom{\sum_{i<j}}\right)\end{multline}
\end_inset
\the_end
