3.4.2 Greatest hits from previous weeks

Greatest hits from previous weeks:

3.4.2.1 Subfigures side by side with captions

http://tex.stackexchange.com/questions/119984/subfigures-side-by-side-with-captions

I am using the following code to put my two figures side by side with different captions, 
\begin{figure*}[t!] 
\centering 
\begin{subfigure}[b]{0.5\textwidth} 
\centering 
...
 

- asked by Sait (32 votes), answered by Luan Resende (43 votes)

3.4.2.2 How to typeset subscript in usual text mode?

http://tex.stackexchange.com/questions/1013/how-to-typeset-subscript-in-usual-text-mode

It's easy to make subscripts in math mode: $a_i$. 
How do I make a subscript outside math environment, likethis?
 

- asked by Pavel Shved (155 votes), answered by Stefan Kottwitz (104 votes)