3.30.2 Greatest hits from previous weeks

Greatest hits from previous weeks:

3.30.2.1 How can I split an equation over two (or more) lines

https://tex.stackexchange.com/questions/3782/how-can-i-split-an-equation-over-two-or-more-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 (165 votes), answered by Will Robertson (116 votes)

3.30.2.2 LaTeX Editors/IDEs

https://tex.stackexchange.com/questions/339/latex-editors-ides

What editors/IDEs are available for easing the process of writing TeX/LaTeX documents? 
Please state some useful features like code completion, spell checking, building final DVI or PDF files, etc. 
...
 

- asked by hayalci (697 votes), answered by YuppieNetworking (305 votes)