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\begin{theorem}  Let $t(G)= \mathrm{something \  dummy} $. Then 
    \item $t(P_r)=r$; 
    \item $t(K_m \times P_r)= r+1 \ \mathrm{for} \  m \geq 2$;

Hi, as above.

How can i make the the numbering and the text "something dummy " and "for" as normal text n non-italic?

Thank you.

marked as duplicate by Werner, cfr, user13907, Jesse, user31729 Aug 9 '15 at 21:34

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  • For the first, why don't you just put the closing $ before something dummy? For the second, if you are loading mathtools or amsmath, try \text{for}. Otherwise \mathrm{for} for serif or \mathsf{for} for sans. – cfr Aug 8 '15 at 0:04
  • \mathrm{} is really for upright serif which is maths. So \text{} would definitely be better here if you are really typesetting text. – cfr Aug 8 '15 at 0:18
  • Hi, \mathrm{for} works well. But what about the numbering? and \text{ } does not work. – Sara Aug 8 '15 at 0:18
  • Since we don't even know how the theorem environment is defined, how should we comment on the numbering? If you could provide a complete example (\documentclass... \end{document}), we'd be more help. – cfr Aug 8 '15 at 0:21
  • The numbering is consistent with the surrounding text. If you wish to change this, you can use enumitem or issue \rmfamily before the enumerate environment. – Werner Aug 8 '15 at 0:22

With enumitem use this code:

\item …

Or even, if you don't want to have to type the optional argument each time, add this to your preamble:

  • Don't you need to say at the beginning of which environment? – cfr Aug 8 '15 at 1:07
  • Oops! Thought of it, and found it was enough, probably· Thanks for pointing it. 'Tis corrected now. – Bernard Aug 8 '15 at 1:35

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