I noticed that some math symbols are not shown on screen. This seems to be platform dependent. The following is a table illustrating the situation on three different platforms. Here "no" means that the symbol is not shown on screen (the symbol is invisible but occupies space: it is as a sort of \phantom), and "yes" that it is shown.
--------------------------------------- Symbol Linux Solaris Cygwin --------------------------------------- \Omega no no no \int yes yes no \oint yes yes no \otimes no no no \nleqslant no no no \spadesuit(*) yes no yes --------------------------------------- (*) On solaris, a square is shown on screen instead of nothing. -- Enrico
