11.63.1 Top new questions this week

11.63.1.1 Defining a verbatim environment as a pair of commands (e.g., using c argspec), with optional argument
11.63.1.2 An enumeration with apostrophes
11.63.1.3 Drawing vertical and horizontal vectors along a BA~(c)zier curve (without local rotation)
11.63.1.4 TikZ bounding box not calculated properly in standalone class
11.63.1.5 How to draw the Ketamine molecular structure using ChemFig?
11.63.1.6 How to double chapter numbers and let hyperref do its work correctly
11.63.1.7 Why can't I use \StrLeft for this macro?
11.63.1.1 Defining a verbatim environment as a pair of commands (e.g., using c argspec), with optional argument

https://tex.stackexchange.com/landing/r/digest?cta=question&id=751189

I'm wondering if it's possible to use the new c arg spec (or any other method) in LaTeX to define a verbatim environment as a pair of commands. I also want the starting command to take an optional ... 
[verbatim] [latex3] [optional-arguments]
 
asked by Karl Berry https://tex.stackexchange.com/landing/r/digest?cta=user&id=63279 Score of 9
answered by David Carlisle https://tex.stackexchange.com/landing/r/digest?cta=user&id=1090 Score of 7
11.63.1.2 An enumeration with apostrophes

https://tex.stackexchange.com/landing/r/digest?cta=question&id=751242

I'm trying to set up an enumeration that would produce two items P_3' and P_3''. My attempt 
\usepackage[shortlabels]{enumitem} 
\newcommand{\apostrophes}[1]{% 
\ifcase\numexpr#1\relax 
\or ' \or '' \... 
[enumerate]
 
asked by Leandro Caniglia https://tex.stackexchange.com/landing/r/digest?cta=user&id=102342 Score of 8
answered by cfr https://tex.stackexchange.com/landing/r/digest?cta=user&id=39222 Score of 9
11.63.1.3 Drawing vertical and horizontal vectors along a BA~(c)zier curve (without local rotation)

https://tex.stackexchange.com/landing/r/digest?cta=question&id=751203

Ia^\200\231m trying to annotate a quadratic BA~(c)zier*  curve in TikZ with vectors. Right now I can draw normal vectors (red arrows) at multiple points along the curve using the decorations.markings library. 
Here ... 
[tikz-pgf] [decorations] [bezier]
 
asked by lukewarn https://tex.stackexchange.com/landing/r/digest?cta=user&id=415378 Score of 8
answered by cfr https://tex.stackexchange.com/landing/r/digest?cta=user&id=39222 Score of 8
11.63.1.4 TikZ bounding box not calculated properly in standalone class

https://tex.stackexchange.com/landing/r/digest?cta=question&id=751224

I'm using tikz to create a figure with a ring and n nodes on it equally separated by an angle of 360A^Degree / n. Since I want the number of nodes to be arbitrary I defined a command which creates the ... 
[tikz-pgf] [standalone] [bounding-box]
 
asked by TheFox https://tex.stackexchange.com/landing/r/digest?cta=user&id=269361 Score of 8
answered by Jasper Habicht https://tex.stackexchange.com/landing/r/digest?cta=user&id=47927 Score of 11
11.63.1.5 How to draw the Ketamine molecular structure using ChemFig?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=751171

How to draw the Ketamine molecular structure using ChemFig? 
Question 
I'm trying to draw the molecular structure of Ketamine (Ca^\202\201a^\202\203Ha^\202\201a^\202\206ClNO) using the chemfig package in LaTeX. I'm having trouble properly ... 
[chemfig] [chemistry]
 
asked by Marco Fanelli https://tex.stackexchange.com/landing/r/digest?cta=user&id=370182 Score of 8
answered by Explorer https://tex.stackexchange.com/landing/r/digest?cta=user&id=322482 Score of 11
11.63.1.6 How to double chapter numbers and let hyperref do its work correctly

https://tex.stackexchange.com/landing/r/digest?cta=question&id=751105

I have the following MWE with the goal to double some chapter numbers (don't ask me why, please). The problem is obviously that the links in the toc do not work anymore (hyperref). How to make these ... 
[hyperref]
 
asked by Christophe https://tex.stackexchange.com/landing/r/digest?cta=user&id=289475 Score of 8
answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 5
11.63.1.7 Why can't I use \StrLeft for this macro?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=751195

I'd like to have a macro which returns the first two letters of a weekday given a certain date (DD.MM.YYYY). 
For example "16.09.2025" would be "Tu". 
\documentclass{article} 
\... 
[macros] [datetime]
 
asked by haifisch123 https://tex.stackexchange.com/landing/r/digest?cta=user&id=292785 Score of 7
answered by Marijn https://tex.stackexchange.com/landing/r/digest?cta=user&id=89417 Score of 7