7.51.2 Greatest hits from previous weeks

7.51.2.1 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 170 votes

answered by Ignasi https://tex.stackexchange.com/landing/r/digest?cta=user&id=1952 123 votes

7.51.2.2 How can I have two tables side by side?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=2832

Suppose I have two tables that don't have many columns (3, for example). How can I position them side by side? 
[tables] [positioning]
 

asked by bada https://tex.stackexchange.com/landing/r/digest?cta=user&id=572 196 votes

answered by TH. https://tex.stackexchange.com/landing/r/digest?cta=user&id=647 182 votes

7.51.2.3 Big Parenthesis in an Equation

https://tex.stackexchange.com/landing/r/digest?cta=question&id=38868

I have an equation contained inside \[...\], which automatically makes a \sum with sub- and superscripts turn big--so that the summation sign looks awkward inside parenthesis.  Any idea how to make ... 
[math-mode] [delimiters]
 

asked by jamaicanworm https://tex.stackexchange.com/landing/r/digest?cta=user&id=9757 214 votes

answered by qubyte https://tex.stackexchange.com/landing/r/digest?cta=user&id=9043 311 votes

7.51.2.4 How to add an extra level of sections with headings below \subsubsection

https://tex.stackexchange.com/landing/r/digest?cta=question&id=60209

I have a document which requires many levels of sectioning. I have sections, subsections and subsubsections, but require one more level below that. I can't change the sections to be parts and move ... 
[sectioning] [sections-paragraphs]
 

asked by robintw https://tex.stackexchange.com/landing/r/digest?cta=user&id=495 327 votes

answered by Gonzalo Medina https://tex.stackexchange.com/landing/r/digest?cta=user&id=3954 287 votes

7.51.2.5 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 user5419 https://tex.stackexchange.com/landing/r/digest?cta=user&id=5419 381 votes

answered by Martin Scharrer https://tex.stackexchange.com/landing/r/digest?cta=user&id=2975 300 votes

7.51.2.6 "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=10 100 votes

answered by Antal Spector-Zabusky https://tex.stackexchange.com/landing/r/digest?cta=user&id=1425 92 votes

7.51.2.7 How to influence the position of float environments like figure and table in LaTeX?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=39017

How to influence the position of float environments like figure and table in LaTeX? 
This is a general question and should collect useful answers for all users. I hope we can use this as a reference 
[floats] [positioning]
 

asked by Marco Daniel https://tex.stackexchange.com/landing/r/digest?cta=user&id=5239 671 votes

answered by Frank Mittelbach https://tex.stackexchange.com/landing/r/digest?cta=user&id=10109 966 votes