Nicolas, >> \[ x = y >> +1 \] >> >> \[ x = y >> + 1 \] > > This is to be expected. In the second case, the second line defines > a list item, which has precedence over any LaTeX snippet.

Okay, I realised it was switching to the itemise environment, but I didn't know it took precedence over the latex environment. >> \[ x = \begin{array}{cc} >> y & u \\ >> z & v >> \end{array} \] >> >> \[ x = >> \begin{array}{cc} >> y & u \\ >> z & v >> \end{array} \] > > I think this is because of a limitation on the number of lines a LaTeX > snippet can span across (IIRC, 3 is the maximum). Maybe, but I see the same problem with the following two line example \[ x = \begin{array}{cc} z & v \end{array} \] > In both cases, I suggest to use LaTeX environments instead: > > \begin{equation*} > x = y > + 1 > \end{equation*} Yes, I tried that, but as I understand it I need to \usepackage{amsmath} to access the latex equation* environment. But then I get an error about "Command \iint already defined." I tried the solution described at http://www.tex.ac.uk/cgi-bin/texfaq2html?label=alreadydef, but it didn't work for me. Anyway, never mind, these are all quite trivial points. Thanks very much for your help, Paul