4.15.1 Top new questions this week

4.15.1.1 What is the purpose of "\left.", i.e., "\left" followed by a period?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=429437

What is the purpose of \left., i.e., \left followed by a period? 
Similarly for \right. 
E.g. for \right. and \left (no period) 
begin{eqnarray}\label{Dsys} 
\textcolor[rgb]{.25,.0,.8}{% 
... 
[math-mode] [delimiters]
 

asked by peter https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=162068 16 votes

answered by Mico https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=5001 31 votes

4.15.1.2 Pacman circle in TikZ

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=428967

I want to draw the Pacman circle on TikZ: 
http://www.vectorstash.com/content/pac-man 
Drawing a circle and filling in a color is easy; it's the mouth part that's troubling me. I can draw the two  ... 
[tikz-pgf]
 

asked by user11550 https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=161869 15 votes

answered by caverac https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=152462 28 votes

4.15.1.3 Is PSTricks breaking LaTeX?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=429413

Sorry for the newspaper headline title :P 
I have a document in which I (ab)use LaTeX's control structures, namely \@for. Naturally, the contents of some of these loops contain \par agraph breaks. 
I  ... 
[pstricks] [bugs]
 

asked by Phelype Oleinik https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=134574 14 votes

answered by David Carlisle https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=1090 12 votes

4.15.1.4 siunitx, input-symbols =  ( - ) , group-four-digits, group-separator= ,

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=428820

please, consider the following mwe: 
\documentclass[margin=3mm]{standalone} 
\usepackage{siunitx} 
\sisetup{input-symbols = {( - )}, 
table-space-text-post=***, 
... 
[siunitx]
 

asked by Zarko https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=18189 12 votes

answered by Joseph Wright https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=73 10 votes

4.15.1.5 TeXbook - Chapter 12: Glue - Exercise 12.8

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=429139

Exercise 12.8 
Assume that \box1 is 1 pt high, 1 pt deep, and 1 pt wide; \box2 is 2 pt high, 2 pt deep, and 2 pt wide. A third box is formed by saying 
\setbox3=\hbox  ... 
[boxes] [glue]
 

asked by Zac https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=158820 11 votes

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

4.15.1.6 How to make all i's and j's dotless, glyph substitution

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=428783

I just learned about the existence of dotless i's and j's- \i and \j, which happens to be how I write them out by hand. Would there be a way of making all occurrences of both appear dotless with some  ... 
[fonts] [xetex]
 

asked by vlg https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=80758 11 votes

answered by Alan Munn https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=2693 21 votes

4.15.1.7 Context : How to install and use new opentype (math) fonts?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=429621

Motivation : I'm a die-hard user of LaTeX which is intrigued by ConTeXt and try to learn enough of it to be able to judge on its usability. For now, I'm limiting myself to Mark IV/LuaTeX (Mark II  ... 
[context] [opentype] [math-fonts]
 

asked by user2903730 https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=69555 10 votes

answered by Henri Menke https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=10995 8 votes