7.64.2 Greatest hits from previous weeks

7.64.2.1 How to create fixed width table columns with text raggedright/centered/raggedleft?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=12703

I would like to create a table with some columns' width specified, while the text in those columns should be centered both horizontally and vertically. I found out that 
\usepackage{array} 
\begin{... 
[tables] [horizontal-alignment] [width]
 

asked by Covi https://tex.stackexchange.com/landing/r/digest?cta=user&id=3970 280 votes

answered by lockstep https://tex.stackexchange.com/landing/r/digest?cta=user&id=510 434 votes

7.64.2.2 When should I use \input vs. \include?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=246

There are two different commands to incorporate another file into the source of some document, \input and \include. When should I use one or the other? What are the differences between them? Are there ... 
[include] [input]
 

asked by Phil Miller https://tex.stackexchange.com/landing/r/digest?cta=user&id=60 1309 votes

answered by Michael Mrozek https://tex.stackexchange.com/landing/r/digest?cta=user&id=29 1173 votes

7.64.2.3 Double line spacing

https://tex.stackexchange.com/landing/r/digest?cta=question&id=819

I would like to typeset a draft of my document with double linespacing so that my collaborators have space to write in their edits (with a pen).  How do I do it? 
[line-spacing] [setspace]
 

asked by Vebjorn Ljosa https://tex.stackexchange.com/landing/r/digest?cta=user&id=35 227 votes

answered by Stefan Kottwitz https://tex.stackexchange.com/landing/r/digest?cta=user&id=213 165 votes

7.64.2.4 Column and row padding in tables

https://tex.stackexchange.com/landing/r/digest?cta=question&id=31672

How do you guys go about controlling column padding in tables? 
Update 
To clarify, I'm looking for a way to control both vertical and horizontal padding. So, if I had a simple table like in the ... 
[tables] [spacing] [columns]
 

asked by JustDanyul https://tex.stackexchange.com/landing/r/digest?cta=user&id=8615 404 votes

answered by Werner https://tex.stackexchange.com/landing/r/digest?cta=user&id=5764 323 votes

7.64.2.5 \mathbb Z  yields undefined control sequence error

https://tex.stackexchange.com/landing/r/digest?cta=question&id=38769

I am using WinEdt 6 for compiling my TeX documents. I am getting an error with contains the line $\mathbb{Z}$ showing that it is undefined control sequence. How should I rectify it? Should I include ... 
[math-mode] [errors] [symbols]
 

asked by Ramana Venkata https://tex.stackexchange.com/landing/r/digest?cta=user&id=10154 205 votes

7.64.2.6 Keeping tables/figures close to where they are mentioned

https://tex.stackexchange.com/landing/r/digest?cta=question&id=2275

Is there any package or a method to force LaTeX to keep floating environments like table and figure closer to where they are declared? 
[floats] [positioning]
 

asked by artimess https://tex.stackexchange.com/landing/r/digest?cta=user&id=833 367 votes

answered by Stefan Kottwitz https://tex.stackexchange.com/landing/r/digest?cta=user&id=213 367 votes

7.64.2.7 How to write cases with 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 
I appreciate any help. 
Edited: I'm sorry to add this ... 
[math-mode] [cases]
                                                                                  

                                                                                  
 

asked by MaryA~ https://tex.stackexchange.com/landing/r/digest?cta=user&id=65856 176 votes

answered by Ignasi https://tex.stackexchange.com/landing/r/digest?cta=user&id=1952 126 votes