11.8.2 Greatest hits from previous weeks

11.8.2.1 How can I write cases with grouping braces on both left and right side, and split the condition into two lines in LaTeX?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=240868

The code I used to write 
is this one 
$$ 
X(m,n)= 
\begin{cases} 
x(n),\\ 
x(n-1)\\ 
x(n-1) 
\end{cases} 
$$ 
But I don't know how to write this one 
Also, what if I want to write this 
[math-mode] [cases]
 

asked by MaryA~ https://tex.stackexchange.com/landing/r/digest?cta=user&id=65856 Score of 207

answered by Ignasi https://tex.stackexchange.com/landing/r/digest?cta=user&id=1952 Score of 147

11.8.2.2 Change line spacing inside the document

https://tex.stackexchange.com/landing/r/digest?cta=question&id=83855

This is my code 
\documentclass[12pt,a4paper]{book} 
\renewcommand{\baselinestretch}{1.5} 
\begin{document} 
\include{Chapter1} 
\end{document} 
I have please a question: 
I would change the line ... 
[line-spacing]
 

asked by researcher https://tex.stackexchange.com/landing/r/digest?cta=user&id=16097 Score of 191

answered by Peter Grill https://tex.stackexchange.com/landing/r/digest?cta=user&id=4301 Score of 173

11.8.2.3 Commenting out large sections

https://tex.stackexchange.com/landing/r/digest?cta=question&id=17816

To "comment out" a line, I need to insert a % at the beginning of the line (so that the line will not be compiled). 
Is there a way to comment out a large section without having to manually ... 
[comments]
 

asked by BeauGeste https://tex.stackexchange.com/landing/r/digest?cta=user&id=5419 Score of 464

answered by Martin Scharrer https://tex.stackexchange.com/landing/r/digest?cta=user&id=2975 Score of 374

11.8.2.4 What are all the font styles I can use in math mode?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=58098

As can be seen in above picture, there are lots of fonts or font styles that can be used in math mode. 
What are all the fonts or font styles I can use in math mode, and which packages are required in ... 
[fonts] [math-mode] [big-list] [latin-modern] [computer-modern]
 

asked by doncherry https://tex.stackexchange.com/landing/r/digest?cta=user&id=4012 Score of 624

answered by Christian https://tex.stackexchange.com/landing/r/digest?cta=user&id=13450 Score of 805

11.8.2.5 How to typeset subscript in usual text mode?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=1013

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

asked by P Shved https://tex.stackexchange.com/landing/r/digest?cta=user&id=280 Score of 324

answered by Stefan Kottwitz https://tex.stackexchange.com/landing/r/digest?cta=user&id=213 Score of 213

11.8.2.6 Remove ugly borders around clickable cross-references and hyperlinks

https://tex.stackexchange.com/landing/r/digest?cta=question&id=823

I know that I can use hyperref to make cross-references and hyperlinks clickable.  That makes the clickable areas outlined in fluorescent green, however.  How can I make the green boxes go away? 
[hyperref] [color] [boxes] [links]
 

asked by Vebjorn Ljosa https://tex.stackexchange.com/landing/r/digest?cta=user&id=35 Score of 1153

answered by meep.meep https://tex.stackexchange.com/landing/r/digest?cta=user&id=3735 Score of 1097

11.8.2.7 How to change certain pages into landscape/portrait mode

https://tex.stackexchange.com/landing/r/digest?cta=question&id=337

How can I change the orientation of some pages of my document into landscape mode, while leaving the others in portrait mode (or vice versa)? 
[landscape]
 

asked by hayalci https://tex.stackexchange.com/landing/r/digest?cta=user&id=183 Score of 465

answered by rcs https://tex.stackexchange.com/landing/r/digest?cta=user&id=118 Score of 479