5.38.1 Top new questions this week

5.38.1.1 Bo Derek in texbook.tex?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=515687

texbook.tex contains a double-dangerous-bend exercise which starts at line 18198 : 
\ddangerexercise ^{Powers of ten}: The whole \TeX\ language has now been 
summarized completely. To~demonstrate how  ... 
[fun] [tex-history] [knuth] [texbook.tex]
 

asked by Ulrich Diez https://tex.stackexchange.com/landing/r/digest?cta=user&id=118714 22 votes

answered by Richard Sullivan https://tex.stackexchange.com/landing/r/digest?cta=user&id=36701 21 votes

5.38.1.2 Conversion of space characters into space tokens

https://tex.stackexchange.com/landing/r/digest?cta=question&id=516101

I'm trying to understand how the input, the expansion, and the execution processors work together. Running TeX on 
\def\foo#1{(#1)\baz}% 
\def\baz{baz}% 
\foo{bla} Bar 
\bye 
yields "(bla)baz Bar" with  ... 
[macros] [expansion]
 

asked by campa https://tex.stackexchange.com/landing/r/digest?cta=user&id=82917 10 votes

answered by Ulrich Diez https://tex.stackexchange.com/landing/r/digest?cta=user&id=118714 6 votes

5.38.1.3 What changed related to \ne in TeXLive 2019?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=516059

Did something change related to \ne recenetly? 
The MWE below in TeXLive 2018 yields the expected output 
but with TeXLive 2019 (with all packages up to date as of today) I get 
Argument of \ne  ... 
[math-mode] [macros] [amsmath] [texlive-2019]
 

asked by Peter Grill https://tex.stackexchange.com/landing/r/digest?cta=user&id=4301 10 votes

answered by Phelype Oleinik https://tex.stackexchange.com/landing/r/digest?cta=user&id=134574 13 votes

5.38.1.4 how make a equation a little smaller

https://tex.stackexchange.com/landing/r/digest?cta=question&id=516298

how I can make a little the following equation smaller? 
\begin{equation} 
\dfrac{1}{\psi_{m}}=\dfrac{1}{\sum_{k=0}^{n-1}c_{k}\exp(\frac{-2\pi imk}{n})}}=\dfrac{1}{\langle V_{m},c \rangle+i\langle  ... 
[equations] [size] [multline]
 

asked by user9272398 https://tex.stackexchange.com/landing/r/digest?cta=user&id=201139 8 votes

answered by Zarko https://tex.stackexchange.com/landing/r/digest?cta=user&id=18189 10 votes

5.38.1.5 What is the purpose of the optional <type> argument in \definecolor & friends?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=516183

The xcolor package defines the commands \definecolor, \providecolor, and \colorlet as follows: 
\definecolor      [<type>]{<name>}{<model-list>}{<spec-list>} 
\providecolor      ... 
[color]
 

asked by The Riddler https://tex.stackexchange.com/landing/r/digest?cta=user&id=199725 7 votes

answered by Ulrike Fischer https://tex.stackexchange.com/landing/r/digest?cta=user&id=2388 3 votes

5.38.1.6 How to use composite Tikz pics with rotation

https://tex.stackexchange.com/landing/r/digest?cta=question&id=515844

I am trying to draw a tiled pattern, building it from simpler elements using pic. 
This is a simplified version of my code 
\documentclass[tikz,border=2mm]{standalone} 
\usepackage{tikz} 
... 
[tikz-pgf] [tikz-pic]
 

asked by pheon https://tex.stackexchange.com/landing/r/digest?cta=user&id=22030 7 votes

answered by SchrA~\[Paragraph]dinger's cat https://tex.stackexchange.com/landing/r/digest?cta=user&id=194703 8 votes

5.38.1.7 Resonance structure of acetate

https://tex.stackexchange.com/landing/r/digest?cta=question&id=515848

I need to draw a scheme to show the stabilization of the acetate ion by resonance and I'm going crazy :-( 
I started using chemfig not so long ago and it seems that I need a lot more practice! In the  ... 
[chemfig]
 

asked by Sam https://tex.stackexchange.com/landing/r/digest?cta=user&id=201118 7 votes

answered by andselisk https://tex.stackexchange.com/landing/r/digest?cta=user&id=124323 8 votes