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With beamer, I use the theme Montpellier, a sober theme giving basic navigational hints.

\usetheme{Montpellier}                 
\useinnertheme{default}
\useoutertheme{default}
\usecolortheme{default}             
\usefonttheme{professionalfonts}  

Exampe

I would like to reduce the width of the separation lines. Can you help me to perform that task?

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Hi, welcome to TeX.SX. Note that you can use backticks ` to mark inline code as well as package names. It's not necessary to begin your question with a greeting or have a closing line. –  Martin Scharrer Apr 2 '11 at 12:37
    
@MArtin Scharrer: Ok, thank for the advice –  Marco Apr 2 '11 at 12:59
    
You are aware, I am sure, that your proof is incorrect? q+1 does not need to be prime, however it is not divisible by any known primes, and thus only divisible by unknown primes. –  Mikael Vejdemo-Johansson Apr 2 '11 at 15:40
    
@Mikael Vejdemo-Johansson: Oh, actually, this is not my proof. The picture comes from a user guide and I have chosen it to illustrate the theme. But since q+1 is larger than 1 it is divisible by some prime k (Fundamental theorem of Arithmetic). This prime k must be one the primes that is less than or equal to p, by our assumption that p is the largest prime. So k divides the q. Finally, since k divides both q+1 and q, it also divides 1, which is impossible. ;-) –  Marco Apr 2 '11 at 16:29
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1 Answer

up vote 1 down vote accepted

I'm not a great expert with Beamer but I think you need to change the lines in the file : beamerouterthemetree.sty

\begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{upper separation line head}
\end{beamercolorbox} 
 ...
\begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{lower separation line head}
\end{beamercolorbox} 

You can replace 1.5 pt by 0.8pt. A safe method is to copy this file inside the work folder or inside your texmf folder. Perhaps there is a setup macro in beamer to modify these values.

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Many thanks –  Marco Apr 2 '11 at 13:32
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