4.42.1 Top new questions this week

4.42.1.1 Why \underbrace has _ ...  instead of an optional parameter?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=462798

Why is \underbrace (and similar commands) in the form 
\underbrace{my formula}_{some text under my formula} 
? 
Shouldn't a standard macro be in the form 
\underbrace[some text under my formula]{my  ... 
[math-mode] [macros]
 

asked by CarLaTeX https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=101651 25 votes

answered by Joseph Wright https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=73 17 votes

4.42.1.2 How to draw A a^\212\225 B a^\212\225 C as a Venn diagram?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=462520

You see my code and please answer my two questions: 
\documentclass{article} 
\usepackage{amsmath,amssymb,mathptmx} 
\usepackage{pstricks} 
\usepackage{pst-node} 
\usepackage{auto-pst-pdf} 
... 
[color] [pstricks]
 

asked by chishimotoji https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=173875 17 votes

answered by Artificial Stupidity https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=87876 19 votes

4.42.1.3 Does LPPL allow package development with pull requests etc.?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=462993

Many packages are nowadays developed on github or similar platforms and if I want to contribute a bugfix to some package (of which I'm not the author), my usual workflow is to fork the repo, develop  ... 
[package-writing] [licensing]
 

asked by user176037 https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=176037 14 votes

answered by Joseph Wright https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=73 13 votes

4.42.1.4 What is the best practice to pass spaces to Lua from expl3?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=463276

In LuaTeX, using the \directlua primitive (within a standard LaTeX2e setup) 
\directlua{tex.print("Hello World!")} 
will produce "Hello World!" to the output PDF. 
On the other hand, in expl3 code 
... 
[luatex] [expl3]
 

asked by wtsnjp https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=152782 11 votes

answered by Joseph Wright https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=73 13 votes

4.42.1.5 A Spiral of numbers

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=462906

I am trying to produce a spiral of numbers from 1 through 101 with the following properties: 
-- multiples of 5 are in a node shaped like pentagon 
-- there is a special starburst node at numbers 3,  ... 
[tikz-pgf] [tikz-styles]
 

asked by kan https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=10679 11 votes

answered by Andrew https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=30471 21 votes

4.42.1.6 How do I draw the following symbols

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=462833

I am trying to represent the calculus of relations, from Tarski's paper. How do I represent the following  ? 
SideNote: 
I did go throughhttp://math.mit.edu/~dspivak/files/symbols-all.pdf 
and  ... 
[symbols] [relation-symbols]
                                                                                  

                                                                                  
 

asked by GermanShepherd https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=59288 10 votes

answered by egreg https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=4427 16 votes

4.42.1.7 Shorten fraction line

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=462509

I understand that this request may sound stupid, but my eyes are just bleeding when I see how $\frac{x^-}{2}$ is rendered: 
I'm wondering if there's a moderately simple way to make it look like  ... 
[fractions]
 

asked by mavzolej https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=94788 10 votes

answered by egreg https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=4427 4 votes