7.12.1 Top new questions this week

7.12.1.1 How to draw a 'halftone' spiral made of circles in LaTeX?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=584455

I would like to use LaTeX to draw a spiral like the one below, but it's way out of my league. Any help would be much appreciated. 
NEW EDIT: (now with a better 3d look!) after playing a bit with ... 
[tikz-pgf]
 

asked by JoA~\[Sterling]o LourenA~\[Section]ohttps://tex.stackexchange.com/landing/r/digest?cta=user&id=73964 15 votes

answered by Jasper Habicht https://tex.stackexchange.com/landing/r/digest?cta=user&id=47927 25 votes

7.12.1.2 Fibonacci macro

https://tex.stackexchange.com/landing/r/digest?cta=question&id=584474

I am trying to make a Fibonacci macro, that works as follows. 
I was able to do so, and I tried to make everything private by using @ (i know it isn't necessary here, but I am trying to practice...). ... 
[macros] [errors] [loops] [recursion] [robust-commands]
 

asked by needle https://tex.stackexchange.com/landing/r/digest?cta=user&id=235026 7 votes

answered by David Carlisle https://tex.stackexchange.com/landing/r/digest?cta=user&id=1090 8 votes

7.12.1.3 Writing in Ancient Greek with babel

https://tex.stackexchange.com/landing/r/digest?cta=question&id=584397

I'm using babel to write in ancient greek. 
I'm interested in LGR Latin transliteration, which is described in the following table (taken from here): 
Everything worked fine, except for the perispomeni ... 
[babel] [babel-greek]
 

asked by rmdmc89 https://tex.stackexchange.com/landing/r/digest?cta=user&id=174335 7 votes

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 9 votes

7.12.1.4 How to reproduce vertical bars with trangles on the side, used for the r.o.c. of the Laplace transform?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=583869

what is the command for this symbol? this symbol is to represent the bounds of ROC of laplace transform. looked up online latex documents, still couldn't find this symbol. 
[symbols]
 

asked by vinny https://tex.stackexchange.com/landing/r/digest?cta=user&id=235506 7 votes

answered by Steven B. Segletes https://tex.stackexchange.com/landing/r/digest?cta=user&id=25858 11 votes

7.12.1.5 Diagonal brace with nested parenthesis

https://tex.stackexchange.com/landing/r/digest?cta=question&id=584607

I would to obtain a result similar to the image below. 
So far I only have \bigg( \Big(   \big( a^q \big)^q \Big)^{\rotatebox{25}{$\cdots$}} \bigg)^q, without the brace. 
I tried to follow this question,... 
[brackets] [underbrace]
 

asked by Watson https://tex.stackexchange.com/landing/r/digest?cta=user&id=94816 6 votes

answered by campa https://tex.stackexchange.com/landing/r/digest?cta=user&id=82917 4 votes

7.12.1.6 How has plain.tex been updated?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=584572

I've noticed that on CTAN there is a new version of the file plain.tex, dating 2021-01-17.  But nowehere I see what the changes are.  What has changed? 
[plain-tex]
 

asked by User https://tex.stackexchange.com/landing/r/digest?cta=user&id=43121 6 votes

answered by David Carlisle https://tex.stackexchange.com/landing/r/digest?cta=user&id=1090 3 votes

7.12.1.7 Ackermann Function

https://tex.stackexchange.com/landing/r/digest?cta=question&id=584112

I am trying to write a macro to evaluate the result of the Ackermann function. 
If anyone doesn't know it, is defined as follows: 
So I am trying to write a code that is able to compute it but I can't ... 
[macros] [errors] [recursion] [robust-commands]
 

asked by needle https://tex.stackexchange.com/landing/r/digest?cta=user&id=235026 6 votes

answered by Ulrich Diez https://tex.stackexchange.com/landing/r/digest?cta=user&id=118714 11 votes