9.37.1 Top new questions this week

9.37.1.1 How does TeX know whether to eat this space if its catcode is about to change?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=687592

In the document 
\catcode32=13\def {o} \bye 
how does TeX know to tokenise the space after \def as an active character? 
Details: The correct result is o. First, we set spaces (ASCII 32) to be active ... 
[tex-core]
 

asked by Marnanel Thurman https://tex.stackexchange.com/landing/r/digest?cta=user&id=259978 Score of 12

answered by Ulrich Diez https://tex.stackexchange.com/landing/r/digest?cta=user&id=118714 Score of 7

9.37.1.2 I want to draw a 3-hyperlink (hyperedge with four nodes) as shown below? I have also included the code for my attempt at that

https://tex.stackexchange.com/landing/r/digest?cta=question&id=687673

\documentclass[crop, tikz]{standalone} 
\usepackage{tikz} 
\usetikzlibrary{topaths,calc, backgrounds} 
\begin{document} 
\begin{tikzpicture} 
% Define the nodes and their positions 
\node[draw,... 
[tikz-pgf] [graphs]
 

asked by tonygrey https://tex.stackexchange.com/landing/r/digest?cta=user&id=291025 Score of 7

answered by Sandy G https://tex.stackexchange.com/landing/r/digest?cta=user&id=125871 Score of 9

9.37.1.3 Tikz: arrows midway in draw

https://tex.stackexchange.com/landing/r/digest?cta=question&id=687303

I need to draw an arrow midway in a line. 
MWE: 
\documentclass{standalone} 
\usepackage{tikz} 
\begin{document} 
\begin{tikzpicture} 
\draw(1,1) -- (1,17); 
\draw(1,17)--(7,17)--(12,12)--... 
[tikz-pgf] [diagrams] [tikz-arrows]
 

asked by john https://tex.stackexchange.com/landing/r/digest?cta=user&id=249546 Score of 6

answered by Zarko https://tex.stackexchange.com/landing/r/digest?cta=user&id=18189 Score of 7

9.37.1.4 Tikz: Different line cap at beginning and end of line

https://tex.stackexchange.com/landing/r/digest?cta=question&id=687820

Is it possible to draw a line which has line cap=round at the beginning and line cap=rect at the end? In the MWE below, that would correspond with drawing this whole thing as one black line instead of ... 
[tikz-pgf]
 

asked by user1476176 https://tex.stackexchange.com/landing/r/digest?cta=user&id=49395 Score of 5

answered by Qrrbrbirlbel https://tex.stackexchange.com/landing/r/digest?cta=user&id=16595 Score of 5

9.37.1.5 Redefined `epsilon` to `varepsilon`

https://tex.stackexchange.com/landing/r/digest?cta=question&id=687819

MWE: 
% !TeX program = xelatex 
\documentclass{article} 
\usepackage{libertinus} 
\renewcommand{\epsilon}{\varepsilon} 
\begin{document} 
This is \texttt{varepsilon}: $\varepsilon$. 
This ... 
[math-mode] [xetex] [unicode-math] [renewcommand] [libertinus]
 

asked by Evan Tseng https://tex.stackexchange.com/landing/r/digest?cta=user&id=278267 Score of 5

answered by Mico https://tex.stackexchange.com/landing/r/digest?cta=user&id=5001 Score of 4

9.37.1.6 Old style union and intersection symbols

https://tex.stackexchange.com/landing/r/digest?cta=question&id=687725

I find books typeset before 1970 sometimes more comfortable to read than more modern versions. I am trying to get this older book style for some of my LaTeX documents. Thanks to TeX Exchange I get ... 
[math-fonts]
 

asked by Philippe Cara https://tex.stackexchange.com/landing/r/digest?cta=user&id=298399 Score of 5

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 8

9.37.1.7 Automatic abbreviation in bacterial taxonomy - multiple species of one genus

https://tex.stackexchange.com/landing/r/digest?cta=question&id=687382

In microbiology, the first time a species name is used, it should be written the genus and species in full (Escherichia coli). For all other occurences, the genus should be abbreviated (E. coli). 
I ... 
[acronyms]
 

asked by Sabine https://tex.stackexchange.com/landing/r/digest?cta=user&id=298185 Score of 5

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 3