6.57.1 Top new questions this week

6.57.1.1 LaTeX - What does the '%' character do?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=566578

the % character seems to have a lot of uses. So far, I have encountered it in the following places: 
For writing comments 
% Schrodinger wave equation 
$$\nabla^2\psi + \frac{8\pi^2m}{h^2}(E-V) = 0$$ 
(... 
[tex-core] [syntax]
 

asked by Aniruddha Deb https://tex.stackexchange.com/landing/r/digest?cta=user&id=226617 16 votes

answered by Mico https://tex.stackexchange.com/landing/r/digest?cta=user&id=5001 31 votes

6.57.1.2 How to use \varepsilon as default

https://tex.stackexchange.com/landing/r/digest?cta=question&id=566341

I am writing a document, and I used \epsilon throughout. I would really like to change it to \varepsilon, but manually it would be quite a struggle. 
So the question is whether I can put something in ... 
[fonts]
 

asked by user66094 https://tex.stackexchange.com/landing/r/digest?cta=user&id=172719 9 votes

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 26 votes

6.57.1.3 How does \verb detect spaces that shouldn't exist

https://tex.stackexchange.com/landing/r/digest?cta=question&id=566085

Consider the following MWE: 
\documentclass{article} 
\usepackage{listings} 
\lstset{basicstyle=\ttfamily} 
\begin{document} 
\lstinline |asdf|asdf asdfasdf 
\verb |asdf|asdf asdfasdf 
\end{document} 
... 
[verbatim] [expansion] [tokenization]
 

asked by schtandard https://tex.stackexchange.com/landing/r/digest?cta=user&id=48973 7 votes

answered by Phelype Oleinik https://tex.stackexchange.com/landing/r/digest?cta=user&id=134574 11 votes

6.57.1.4 Unable to compile no matter the package

https://tex.stackexchange.com/landing/r/digest?cta=question&id=565729

I am a first time user and no matter how hard I try I am unable to compile the work into a PDF. To check if my work is not at fault I borrowed an example used to test Serbian output (I have a need to ... 
[undefined] [control] [sequence]
 

asked by ficonni https://tex.stackexchange.com/landing/r/digest?cta=user&id=226173 6 votes

answered by Don Hosek https://tex.stackexchange.com/landing/r/digest?cta=user&id=202780 15 votes

6.57.1.5 What do \vec \mkern0mu x  and \vec    x  mean?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=566414

In the following posts and many other besides [0] [1], I've seen people use \vec{\mkern0mu x}, \vec{{} x}, and variants thereof to adjust the vector arrow's kerning. 
How do these work? What's the ... 
[math-mode] [kerning] [vector]
 

asked by 0az https://tex.stackexchange.com/landing/r/digest?cta=user&id=62650 5 votes

answered by Donald Arseneau https://tex.stackexchange.com/landing/r/digest?cta=user&id=208556 9 votes

6.57.1.6 Draw a Frost circle in Latex

https://tex.stackexchange.com/landing/r/digest?cta=question&id=565956

In chemistry, a Frost circle is a quick method to estimate the relative energy levels of the pi molecular orbitals in a cyclic compound and then based on electron placement judge its aromaticicity. I'... 
[tikz-pgf] [chemfig] [chemistry]
                                                                                  

                                                                                  
 

asked by Ben Norris https://tex.stackexchange.com/landing/r/digest?cta=user&id=167619 5 votes

answered by Sandy G https://tex.stackexchange.com/landing/r/digest?cta=user&id=125871 3 votes

6.57.1.7 Environments create commands? What am I missing?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=566092

I was surprised to discover that when I create an environment in LaTex, a command of the same name is created. For example: 
\documentclass{minimal} 
\newenvironment{foo}{Foo: }{} 
\begin{document} 
\... 
[macros] [environments]
 

asked by Nat Kuhn https://tex.stackexchange.com/landing/r/digest?cta=user&id=47002 5 votes

answered by Steven B. Segletes https://tex.stackexchange.com/landing/r/digest?cta=user&id=25858 6 votes