2.10.2 Greatest hits from previous weeks

Greatest hits from previous weeks:

2.10.2.1 How can I split an equation over two lines

http://tex.stackexchange.com/questions/3782/how-can-i-split-an-equation-over-two-lines

I am having the following equation: 
\begin{equation} 
Q(\lambda,\hat{\lambda}) = -\frac{1}{2} P(O \mid \lambda ) \sum_s \sum_m \sum_t \gamma_m^{(s)} (t) \left( n \log(2 \pi ) + \log \left| C_m^{(s)}  ...
 

- asked by Peter Smit (103 votes), answered by Will Robertson (82 votes)

2.10.2.2 Cannot determine size of graphic

http://tex.stackexchange.com/questions/17734/cannot-determine-size-of-graphic

I'm trying to include graphics in my Latex-file, which I compiled with latex+dvipdf on OS X. Latex however returns this error: "Cannot determine size of graphic" 
My graphic is exported from  ...
 

- asked by user5371 (66 votes), answered by Martin Scharrer (75 votes)