7.42.1 Top new questions this week

7.42.1.1 Tikz railway tracks issue in TeX Live 2021

https://tex.stackexchange.com/landing/r/digest?cta=question&id=604508

Until I upgraded to TeX Live 2021, I was very happy with Mark Wibrow's train tracks. However, under TeX Live 2021, I get very strange behavior; the code from his answer now typesets as the following. 
... 
[tikz-pgf] [tikz-styles] [texlive-2021]
 

asked by Vince Vatter https://tex.stackexchange.com/landing/r/digest?cta=user&id=101494 12 votes

answered by Ulrike Fischer https://tex.stackexchange.com/landing/r/digest?cta=user&id=2388 13 votes

7.42.1.2 String replacement in math mode

https://tex.stackexchange.com/landing/r/digest?cta=question&id=603995

Writing a path in a graph as $a-b-c$ will not typeset as nicely as $a\text{-}b\text{-}c$, so I'm trying to create a macro that performs some string substitution. I tried using xstring, but ... 
[xstring] [substitution]
 

asked by Henning Koehler https://tex.stackexchange.com/landing/r/digest?cta=user&id=132095 7 votes

answered by Don Hosek https://tex.stackexchange.com/landing/r/digest?cta=user&id=202780 7 votes

7.42.1.3 How to replace \not by \centernot?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=604384

I noticed that LaTeX places the slash created by \not weirdly, e.g. in \not\ni. Using \centernot from package centernot looks nice, but for reasons outside of this scope I have no control over the ... 
[renewcommand]
 

asked by peter https://tex.stackexchange.com/landing/r/digest?cta=user&id=5194 6 votes

answered by campa https://tex.stackexchange.com/landing/r/digest?cta=user&id=82917 3 votes

7.42.1.4 How to make the theorem environment flow around campa's code for TeXbook's bend symbol?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=604068

This is a follow up question to this comment. How can I make campa's code for TeXbook's bend symbol work with the theorem environment? 
Consider the following LaTeX code which I saved in a file called ... 
[tikz-pgf] [theorems]
 

asked by Evan Aad https://tex.stackexchange.com/landing/r/digest?cta=user&id=21685 6 votes

7.42.1.5 \mathsurround added on both sides of tables when array package is loaded

https://tex.stackexchange.com/landing/r/digest?cta=question&id=604536

when the length \mathsurround takes a non-zero value, and when some packages (array, tabularx, and others) are used, a space equal to \mathsurround is inserted on both sides of the table. 
Why such a ... 
[tables]
 

asked by B Legrand https://tex.stackexchange.com/landing/r/digest?cta=user&id=209693 6 votes

answered by David Carlisle https://tex.stackexchange.com/landing/r/digest?cta=user&id=1090 5 votes

7.42.1.6 lplfitch package and math environment

https://tex.stackexchange.com/landing/r/digest?cta=question&id=604372

I would like to write letters in math mode, that is in italic, into proofs without using a lot of \textit{} (by the way, $$ doesn't work into proofs environment). 
\documentclass[11pt]{article} 
\... 
[math-mode]
 

asked by Frank https://tex.stackexchange.com/landing/r/digest?cta=user&id=85519 6 votes

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 5 votes

7.42.1.7 Understanding the alignment issues with split and phantom

https://tex.stackexchange.com/landing/r/digest?cta=question&id=604133

As many, I have been a regular visitor of TeX StackExchange for several years. 
Up to now, careful research in the different existing questions and threads had solved almost all my troubles and ... 
[math-mode] [spacing] [alignment] [split]
 

asked by LA~(c)opold Van Brandt https://tex.stackexchange.com/landing/r/digest?cta=user&id=245941 6 votes

answered by LA~(c)opold Van Brandt https://tex.stackexchange.com/landing/r/digest?cta=user&id=245941 1 vote