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In

\begin{displaymath}
P_1, \dots P_m \leftarrow Q_1, \dots, Q_n (m, n \ge 0)
\end{displaymath}

I would like to introduce a bit of spacing before (m, n \ge 0). Maybe put it on the right side? I don't know what would look best or be most standard. But I do know that I need some spacing. A bit more spacing

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3  
Have you tried inserting the instructions \quad or \qquad before (m, n \ge 0)? –  Mico Dec 16 '13 at 16:37
1  
Have a look at Mathmode and its section on spacing. –  Johannes_B Dec 16 '13 at 16:38
    
@Mico: No, but two \qquads to add the spacing looks pretty nice. –  kyl Dec 16 '13 at 17:35
    
@Johannes_B: I'll look into it if I need to write something more math heavy in the future, thanks for the tip! –  kyl Dec 16 '13 at 17:36

2 Answers 2

I inserted two \qquad thanks to Mico's comment. It looks pretty nice.

\begin{displaymath}
P_1, \dots, P_m \leftarrow Q_1, \dots, Q_n \qquad \qquad (m, n \ge 0)
\end{displaymath}

Becomes: enter image description here

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2  
Mico, not Micro... –  karlkoeller Dec 16 '13 at 18:12
1  
@karlkoeller - thanks. :-) I seem to remember a case of Marco Daniel's first name being rendered as "Macro." I guess this site has it all... –  Mico Dec 16 '13 at 19:04
2  
I'd recommend just one qquad, you will soon run out of space using a double qquad, and using just qquad gives more consistency with more equations –  daleif Dec 16 '13 at 19:07

If you want them right-aligned, a quick and dirty way is to abuse the equation-numbering facility available in LaTeX. Use the \tag macro (there is also the starred version if you don't want the brackets).

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