3.31.1 Top new questions this week

3.31.1.1 A newcommand for more than one formula

https://tex.stackexchange.com/questions/389786/a-newcommand-for-more-than-one-formula

I have some formula such as z_{(h_{1},h_{2},h_{3})} and z_{(h_{4},h_{5},h_{6})}. How can one introduce a \newcommand{}{} for all of such formulas? 
Thanks in advance
 

- asked by Fahim B (15 votes), answered by egreg (15 votes)

3.31.1.2 How to draw a (colored) arrow on a path?

https://tex.stackexchange.com/questions/389731/how-to-draw-a-colored-arrow-on-a-path

I tried to draw a path and a curve length marker. This is the desired result: 
This would be easy if the curve was defined as a function, then I'd just set the domain, add some markers, done. But  ...
 

- asked by jaytar (13 votes), answered by Zarko (13 votes)

3.31.1.3 Differentiate between macros and keywords of the same name in lstlisting

https://tex.stackexchange.com/questions/389365/differentiate-between-macros-and-keywords-of-the-same-name-in-lstlisting

I'd like to display the following code fragment in a lstlisting environment: 
\begin{tikzpicture} 
\duck[stripes=text] 
\stripes{} 
\end{tikzpicture} 
The syntax highlighting should be 
red for  ...
 

- asked by samcarter (12 votes), answered by Ulrike Fischer (7 votes)

3.31.1.4 Kerning with selnolig

https://tex.stackexchange.com/questions/389302/kerning-with-selnolig

You can use the selnolig package to break up inappropriate ligatures 
automatically.  For example, 'leaflet' should arguably not have an fl-ligature, 
and this can be prevented with  ...
 

- asked by Toothrot (11 votes), answered by David Carlisle (7 votes)

3.31.1.5 Is Enumerate default?

https://tex.stackexchange.com/questions/390197/is-enumerate-default

I'm relatively new to TeX and I'm wondering why I'm able to use \begin{enumerate} without importing the package for the article, beamer, and letter document classes. But most users seem to add  ...
 

- asked by rb612 (9 votes), answered by Werner (11 votes)

3.31.1.6 \tikz \draw[violet] (0,0) circle (rand+2) is an oval!

https://tex.stackexchange.com/questions/389920/tikz-drawviolet-0-0-circle-rand2-is-an-oval

can someone please explain to me why I get an oval from this command? 
thanks. 
\documentclass[tikz, border=3mm]{standalone} 
\begin{document} 
\tikz \draw[violet] (0,0) circle (rand+2); 
\end{document} 
...
 

- asked by Aria (8 votes), answered by TorbjA~,rn T. (6 votes)

3.31.1.7 \renewcommand \theequation  and \renewcommand \eqref  simultaneously

https://tex.stackexchange.com/questions/389895/renewcommand-theequation-and-renewcommand-eqref-simultaneously

I'm trying to change the output of equation numbering in the text and next to each equation simultaneously. 
For example, for the 1st eqn, I would like to add "eqn 1" after the equation, and cite it in  ...
 

- asked by michela (6 votes), answered by Christian Hupfer (4 votes)