Marcelo Acuña wrote:
> What is the meaning of tolerance and emergencystretch.

\tolerance is a penalty value that defines how much "badness" (in line 
setting) TeX accepts without yielding an error (and retrying to set the 
paragraph differently). The higher the value, the more interword space is 
tolerated.

\emergencystretch defines how much interword stretching TeX allows if 
necessary.

Details are explained here:
http://www.tex.ac.uk/cgi-bin/texfaq2html?label=overfull

> I need a flexibilty in the page height (really text height) because I have
> some problems with prematures page break for a few milimeters but I don`t
> know how to get it. Is tolerance or emergencystretch the way for get it?

I would try \enlargethispage{10pt} (or any value of your choice) on the 
respective page.

Jürgen

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