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Awesome, it's working! Thanks!

Ok, I've read the text in your link and I've managed to install the amsmath package. Now, I can pdf empty files or files containing just letters and formulas. Thank you!

However, the file I wish to be able to pdf also contain theorems and lemmas from the ams theorem package, and LyX now can't find ...

Hi everyone,

I am a complete LaTeX (and computer) noob. This has motived me years ago to start using LyX because I was getting too many errors I couldn't fix in LaTeX. Now, however, I'm having some troubles in Lyx.

A couple of hours ago, LyX stopped working : when I tried pdf'ing my files, it ...