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Thank you for your help! Unfortunately now prescript again doesn't work, and the error file is 56 k long.

EDIT: In fact, OooLaTeX has completely stopped working, always producing an error message.

EDIT 2: Removed tensor package from preamble. It prevented even 1+1 from working. Now the 1+1 and ...

Yes, that is how it works. But I would like k and l to be italics. I don't know how do I prevent a fresh install of a package from being corrupted. I know the package name because you told it, but I don't know what version number I should use. Perhaps that would resolve the issue?

Also, it seems I ...

\ce{^k_lS} is one example of how I'm using it.

Actually, there is still a problem. I can only use \ce or \ch . Using something else causes an error. But \ce puts the big character in italics, which I don't want. \ch puts small characters in non-italics, which I don't want. The center character should not be italic, but the rest should. Is there ...

Thank you, the problem is now solved! I spent many days at this, so thank you very much!

MiKTeX says I have mhchem, but that command (\ce) and none of the others are recognized. I am using OooLatex. Why is a command not recognized despite me having the relevant package? Some other packages mentioned here are missing from my install. I have often tried to install a package and have never ...

I need to have superscript and subscript before a symbol and superscript and subscript after it. Like this:

^n_m C ^p_q

However, sometimes n may be a longer string.

^{200000}_m C ^p_q

If I type that, m will appear at the same place where the 2 is. But m is supposed to be the pre-subscript of ...