7.30.1 Top new questions this week

7.30.1.1 *Why* does TeX not allow numbers in command names?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=598250

I am not asking how the syntax of TeX works. I know perfectly well that only letters are allowed in command names, except for single-character names and constructions using \csname. Ia^\200\231m just asking: ... 
[macros] [tex-history]
 

asked by Gaussler https://tex.stackexchange.com/landing/r/digest?cta=user&id=19809 28 votes

answered by Marcel KrA~\274ger https://tex.stackexchange.com/landing/r/digest?cta=user&id=80496 24 votes

7.30.1.2 Fading arrows in TikZ

https://tex.stackexchange.com/landing/r/digest?cta=question&id=597927

I'm trying to add fadings on arrows in a TikZ picture, but when I add a fading on a vertical arrow, the arrow tip partly disappears. 
\documentclass{article} 
\usepackage{tikz} 
\usetikzlibrary{fadings} 
... 
[tikz-pgf]
 

asked by Vincent https://tex.stackexchange.com/landing/r/digest?cta=user&id=201628 11 votes

answered by hpekristiansen https://tex.stackexchange.com/landing/r/digest?cta=user&id=8650 13 votes

7.30.1.3 Understanding all output files when compiling a LaTeX document

https://tex.stackexchange.com/landing/r/digest?cta=question&id=597675

I've been using MiKTeX for a while, but I haven't really understood what all the output files are. I'm using pdflatex and I've just started using biber for bibliography. When I compile a .tex file I ... 
[output]
 

asked by Emanuele Giordano https://tex.stackexchange.com/landing/r/digest?cta=user&id=242471 10 votes

answered by Vincent Kuhlmann https://tex.stackexchange.com/landing/r/digest?cta=user&id=242407 12 votes

7.30.1.4 What is kcatcode in pTeX and upTeX?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=598337

The Japanese TeX engines pTeX and upTeX treat separately Latin and Japanese characters, in a way I don't fully understand.  They introduce a notion of kcatcode of a Japanese character, which takes ... 
[tex-core] [japanese] [ptex]
 

asked by Bruno Le Floch https://tex.stackexchange.com/landing/r/digest?cta=user&id=2707 9 votes

answered by Hironobu YAMASHITA https://tex.stackexchange.com/landing/r/digest?cta=user&id=89193 9 votes

7.30.1.5 siunitx 3 "quotient-mode" has been removed in this release

https://tex.stackexchange.com/landing/r/digest?cta=question&id=598236

With the upgrade to version 3.0.0 of siunitx it is no longer possible to use fractions in units. 
Consider this minimal example: 
\documentclass{article} 
\usepackage{siunitx} 
\sisetup{ 
quotient-mode ... 
[siunitx]
 

asked by Claudio https://tex.stackexchange.com/landing/r/digest?cta=user&id=16713 7 votes

answered by Joseph Wright https://tex.stackexchange.com/landing/r/digest?cta=user&id=73 6 votes

7.30.1.6 How can typeset \qty 4\pi e-7  \henry\per\meter  in siunitx version v3.0.2

https://tex.stackexchange.com/landing/r/digest?cta=question&id=597998

In previous siunitx I was able to typeset permeability constant: 
\SI{4\pi e-7}{\henry\per\meter} 
I just expect that it can be simple rewritten to 
\gty{4\pi e-7}{\henry\per\meter} 
but Siunitx ... 
[siunitx]
 

asked by JardaFait https://tex.stackexchange.com/landing/r/digest?cta=user&id=17229 7 votes

answered by Joseph Wright https://tex.stackexchange.com/landing/r/digest?cta=user&id=73 11 votes

7.30.1.7 Drawing a Recursive Graph

https://tex.stackexchange.com/landing/r/digest?cta=question&id=597789

I think this question will have many downvotes as I don't know how to start and cannot provide enough source code. I am completely new to tikz and I would like to draw a recursive graph generated by ... 
[tikz-pgf]
 

asked by aryafilan el-jauhari https://tex.stackexchange.com/landing/r/digest?cta=user&id=242540 7 votes

answered by Alan Xiang https://tex.stackexchange.com/landing/r/digest?cta=user&id=219915 3 votes