2.38.1 Top new questions this week

2.38.1.1 what is the difference between \twocolumn and \documentclass[twocolumn] book

http://tex.stackexchange.com/questions/332120/what-is-the-difference-between-twocolumn-and-documentclasstwocolumnbook

what is the difference between \twocolumn and \documentclass[twocolumn]{book}? 
when I use \twocolumn , the line spread seems smaller?(compare with the same document using  ...
 

- asked by fairytale (15 votes), answered by Mico (18 votes)

2.38.1.2 How can one create a random GUID?

http://tex.stackexchange.com/questions/332329/how-can-one-create-a-random-guid

GUIDs (or Globally Unique Identifier) are usually stored as 128-bit values, and are commonly displayed as 32 hexadecimal digits with groups separated by hyphens, such as: 
...
 

- asked by Werner (15 votes), answered by egreg (15 votes)

2.38.1.3 How to turn off the yellow duck in TeXStudio

http://tex.stackexchange.com/questions/332307/how-to-turn-off-the-yellow-duck-in-texstudio

I really love TeXStudio, but it has one feature that started to annoy me lately. 
Whenever I want to get more workspace, I start hitting the Esc button. This is a common (among various IDEs) shortcut  ...
 

- asked by ScumCoder (15 votes), answered by samcarter (14 votes)

2.38.1.4 My table doesn't fit; what are my options?

http://tex.stackexchange.com/questions/332902/my-table-doesnt-fit-what-are-my-options

I have a table that I want to insert on a page, but at least one of the following conditions are met: 
The table is too wide to fit within the text block or page. That is, I'm exceeding some  ...
 

- asked by Werner (12 votes), answered by Werner (14 votes)

2.38.1.5 How to enumerate 1; 2.1; 2.2; 3?

http://tex.stackexchange.com/questions/332411/how-to-enumerate-1-2-1-2-2-3

Code 
\documentclass{article} 
\begin{document} 
\begin{enumerate} 
\item Initials 
\item Age 
\begin{enumerate} 
\item Preliminary Condition 
\item Support 
\end{enumerate} 
\item  ...
 

- asked by Masi (12 votes), answered by Zarko (17 votes)

2.38.1.6 Subtracting matrices of the same dimension, how to make them align?

http://tex.stackexchange.com/questions/332662/subtracting-matrices-of-the-same-dimension-how-to-make-them-align

This question has been burning inside of my soul for a while now 
Sometimes I would like to subtract two matrices of the exact same dimension, but since they differ in content ever so slightly,  ...
 

- asked by Beached Whale (10 votes), answered by Heiko Oberdiek (11 votes)

2.38.1.7 How to use variables defined by a \newcommand

http://tex.stackexchange.com/questions/332328/how-to-use-variables-defined-by-a-newcommand

Which of the following two is more correct? And why? And what is the difference? Both produce identical outputs. 
Also, what is the correct place for a \newcommand - before \begin{document} or after? 
...
 

- asked by deshmukh (10 votes), answered by Fran (11 votes)