6.14.1 Top new questions this week

6.14.1.1 TeX rules for determing a \par after comment

https://tex.stackexchange.com/landing/r/digest?cta=question&id=537557

I'm confused about how comments, newlines, and \pars interact in TeX. Consider the following: 
ab 
a b 
a 
b 
a% 
b 
a 
% 
b 
a 
b 
a% 
b 
which produces the output 
ab 
a b 
a b 
ab 
a b 
a 
b 
a 
b 
... 
[tex-core] [paragraphs] [comments]
 

asked by Jason Siefken https://tex.stackexchange.com/landing/r/digest?cta=user&id=117132 11 votes

answered by ShreevatsaR https://tex.stackexchange.com/landing/r/digest?cta=user&id=48 16 votes

6.14.1.2 How can I type the symbol for usual topology $R_ (-) $ in LaTex?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=538193

How could I type the symbol as shown in the picture below? 
I tried to use $\mathbb{R}_{(-)}$ instead, but the - inside can not touch the parenthesis on both sides. 
I want to create a horizontal line  ... 
[symbols] [code]
 

asked by Howardli621 https://tex.stackexchange.com/landing/r/digest?cta=user&id=209002 10 votes

answered by Sigur https://tex.stackexchange.com/landing/r/digest?cta=user&id=14757 10 votes

6.14.1.3 How can I draw dashed lines of this picture?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=538458

I am trying to draw this picture 
I tried 
\documentclass[border=2mm,tikz]{standalone} 
\usepackage{tikz-3dplot} 
\usetikzlibrary{3dtools} 
\tikzset{intersection of line trough/.code args={#1 and  ... 
[tikz-3dplot]
 

asked by minhthien_2016 https://tex.stackexchange.com/landing/r/digest?cta=user&id=15080 10 votes

answered by SchrA~\[Paragraph]dinger's cat https://tex.stackexchange.com/landing/r/digest?cta=user&id=194703 15 votes

6.14.1.4 Drawing a 3D molecule in TikZ

https://tex.stackexchange.com/landing/r/digest?cta=question&id=537739

I'm trying to make a methane molecule in tikz-3d. All that's left is to make the "chemically correct" wedges and dashes. I tried with chemfig, but that only allows for a 2D molecule that pretends to  ... 
[tikz-pgf] [chemfig] [tikz-3dplot]
 

asked by methaneman https://tex.stackexchange.com/landing/r/digest?cta=user&id=212265 9 votes

answered by SchrA~\[Paragraph]dinger's cat https://tex.stackexchange.com/landing/r/digest?cta=user&id=194703 14 votes

6.14.1.5 TeXbook/Exercise 5.6 issues compiling it in expanded form

https://tex.stackexchange.com/landing/r/digest?cta=question&id=537592

Exercise 5.6 of the TeXbook by Knuth reads: 
If you think you understand local and global definitions, here's a little test to make sure: Suppose \c stands for \count1=, \g stands for  ... 
[tex-core]
 

asked by 0xC0000022L https://tex.stackexchange.com/landing/r/digest?cta=user&id=3925 7 votes

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 7 votes

6.14.1.6 Why curly braces are used when setting \spacefactor manually?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=538127

In texbook.tex the following code is used to fake plain TeX format: 
Subsequent paragraphs {\it are\/} indented.*{\spacefactor=3000} 
(See?) The computer breaks a paragraph's 
Obviously, curly braces  ... 
[tex-core]
                                                                                  

                                                                                  
 

asked by Igor Liferenko https://tex.stackexchange.com/landing/r/digest?cta=user&id=70900 6 votes

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

6.14.1.7 Why can I say \input something but not \centerline something?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=537538

I am currently reading through the TeXbook (6th printing, March 1986). 
In chapter 6 Knuth explains that \input story can be used to load/process story.tex. 
However, in the preceding chapter the  ... 
[tex-core]
 

asked by 0xC0000022L https://tex.stackexchange.com/landing/r/digest?cta=user&id=3925 6 votes

answered by Phelype Oleinik https://tex.stackexchange.com/landing/r/digest?cta=user&id=134574 9 votes