8.23.2 Greatest hits from previous weeks

8.23.2.1 What is the "correct" way of embedding text into math mode?
8.23.2.2 When should I use \input vs. \include?
8.23.2.3 How can I write cases with grouping braces on both left and right side, and split the condition into two lines in LaTeX?
8.23.2.4 Crop an inserted image?
8.23.2.5 How can I make an enumerate list start at something other than 1?
8.23.2.6 tlmgr cannot setup TLPDB
8.23.2.7 "inputenc Error: Unicode char \u8" error while trying to write a degree symbol (invisible character)
8.23.2.1 What is the "correct" way of embedding text into math mode?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=3415

Lets say I have something like: 
\[ Let x = number of cats \] 
(This is a contrived example, but pretend we are actually inside a long align environment block...) "Let" and "number of cats" need to ... 
[math-mode]
 
asked by Billy ONeal https://tex.stackexchange.com/landing/r/digest?cta=user&id=192 Score of 263
8.23.2.2 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 Score of 1356
answered by Michael Mrozek https://tex.stackexchange.com/landing/r/digest?cta=user&id=29 Score of 1226
8.23.2.3 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 185
answered by Ignasi https://tex.stackexchange.com/landing/r/digest?cta=user&id=1952 Score of 133
8.23.2.4 Crop an inserted image?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=57418

I'm inserting an image with a simple: 
\includegraphics[height=5cm]{filename.png} 
This results in an image that maintains the aspect ratio, and so gives me something like 6cm width. I only really ... 
[graphics] [crop]
 
asked by naught101 https://tex.stackexchange.com/landing/r/digest?cta=user&id=13192 Score of 271
8.23.2.5 How can I make an enumerate list start at something other than 1?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=142

Sometimes, I want to have enumerate lists in LaTeX start at other than the first value (1, a, i, etc.) How can I make an enumerate list start at an arbitrary value? 
[lists] [numbering] [enumerate]
 
asked by vanden https://tex.stackexchange.com/landing/r/digest?cta=user&id=93 Score of 527
answered by ShreevatsaR https://tex.stackexchange.com/landing/r/digest?cta=user&id=48 Score of 626
8.23.2.6 tlmgr cannot setup TLPDB

https://tex.stackexchange.com/landing/r/digest?cta=question&id=137428

I'm trying to update my installation of texlive 2013 under Ubuntu 13.10. 
However, I followed the instruction on this answer, but I get an error 
(running on Debian, switching to user mode!) 
cannot ... 
[errors] [texlive] [ubuntu]
 
asked by adn https://tex.stackexchange.com/landing/r/digest?cta=user&id=7561 Score of 235
8.23.2.7 "inputenc Error: Unicode char \u8" error while trying to write a degree symbol (invisible character)

https://tex.stackexchange.com/landing/r/digest?cta=question&id=4268

No matter how I try to do it I always get the following error : 
! Package inputenc Error: Unicode char \u8:A^\[DiscretionaryHyphen] not set up for use with LaTeX. 
I have tried using A^\[DiscretionaryHyphen]A^\[DiscretionaryHyphen]A^\[DiscretionaryHyphen]$^{\circ}$, \deg, \textdegree, ... 
[symbols] [unicode]
                                                                                  

                                                                                  
 
asked by levesque https://tex.stackexchange.com/landing/r/digest?cta=user&id=10 Score of 103
answered by Antal Spector-Zabusky https://tex.stackexchange.com/landing/r/digest?cta=user&id=1425 Score of 94