+118725 I just made this up in Texmaker.
It won't work in here at the moment because some of the packages are missing.
Another thing to talk to Andre about - this is often a problems.
More limits by Heureka here
http://web2.0calc.com/questions/if-x-0-what-is-the-qotient-of-40-x#r106714
I tried the code below but it didn't work 
HEUREKA HAS SHOWN ME HOW TO DO IT (14/10/14)
\sum \limits_{n=1}^{\infty} : $$\sum \limits_{n=1}^{\infty}$$
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\displaystyle \lim_{x\rightarrow -1}\;\;\dfrac{|x+1|}{x^2+1}
$$\displaystyle \lim_{x\rightarrow -1}\;\;\dfrac{|x+1|}{x^2+1}$$
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More ideas from LancelotLink
\ V(x)=\dfrac{W}{m}\ = \dfrac{1}{m}\int \limits_{\infty}^{x}\ F\ dx =\dfrac{1}{m}\int \limits_{\infty}^{x}\dfrac{GmM}{x^2}dx=-\dfrac{GM}{x}
$$\ V(x)=\dfrac{W}{m}\ = \dfrac{1}{m}\int \limits_{\infty}^{x}\ F\ dx =\dfrac{1}{m}\int \limits_{\infty}^{x}\dfrac{GmM}{x^2}dx=-\dfrac{GM}{x}$$
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