5.37.1 Top new questions this week

5.37.1.1 How to draw a double napped cone with TikZ

https://tex.stackexchange.com/landing/r/digest?cta=question&id=514801

I would like to reproduce something like this in black and white using TikZ (just the figure not the writing) : 
Here is the code I have so far, but I don't know how to draw the three planes properly  ... 
[tikz-pgf] [tikz-3dplot]
 

asked by Emperor_Udan https://tex.stackexchange.com/landing/r/digest?cta=user&id=199781 18 votes

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

5.37.1.2 Isn't LaTeX a complete software for producing books?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=514595

Many PDF of math books that I have, I am sure (99%) that they has been typesetted using (Pdf)LaTeX. But when I check their properties in PDF reader, the PDF producer name isn't (Pdf)LaTeX surprisingly  ... 
[pdftex] [book-design] [adobe]
 

asked by C.F.G https://tex.stackexchange.com/landing/r/digest?cta=user&id=108724 17 votes

answered by Keks Dose https://tex.stackexchange.com/landing/r/digest?cta=user&id=4736 26 votes

5.37.1.3 Can we rotate symbols in LaTeX? How should we make this diagram?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=515181

I would like to insert this diagram 
Into my LaTeX document. However, I don't know if it is possible at all to rotate symbols, and how they could fit into a diagram (notice that the \cong symbol has  ... 
[tikz-pgf] [symbols] [diagrams] [tikz-cd]
 

asked by Akerbeltz https://tex.stackexchange.com/landing/r/digest?cta=user&id=200553 12 votes

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 14 votes

5.37.1.4 How do I limit the scope of etoolbox environment patching?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=514615

I want to use the etoolbox package to patch a certain environment; but - I only want to do it for a certain stretch of my document. 
Enclosing in curly brances doesn't work: 
\documentclass{article} 
... 
[etoolbox] [scoping] [patching]
 

asked by einpoklum - reinstate Monica https://tex.stackexchange.com/landing/r/digest?cta=user&id=5640 11 votes

answered by moewe https://tex.stackexchange.com/landing/r/digest?cta=user&id=35864 14 votes

5.37.1.5 What are the catcode 11 / letter codepoints in Xe(La)Tex?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=514729

I'm trying to write a (JavaScript) RegEx to turn arbitrary sequences of characters into (hopefully) unique command names. 
Part of the solution would be to replace everything that does not match  ... 
[xetex] [catcodes] [naming]
 

asked by John Frazer https://tex.stackexchange.com/landing/r/digest?cta=user&id=128255 10 votes

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

5.37.1.6 How to draw the following image in TikZ?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=515056

How to draw the following image in TikZ? I can split it into 3 parts and then draw it, but is there any direct trick just by drawing two objects? 
[tikz-pgf] [draw]
 

asked by C.F.G https://tex.stackexchange.com/landing/r/digest?cta=user&id=108724 8 votes

answered by SchrA~\[Paragraph]dinger's cat https://tex.stackexchange.com/landing/r/digest?cta=user&id=194703 13 votes

5.37.1.7 Blur gradient along timeline arrow

https://tex.stackexchange.com/landing/r/digest?cta=question&id=515070

I would like to draw an arrow that begins as a highly blurry rectangle and ends in a defined (no blur) shape. Is this possible in TikZ? A less preferable alternative would be a sequence of aligned  ... 
[tikz-pgf] [pgf-blur]
 

asked by jsb https://tex.stackexchange.com/landing/r/digest?cta=user&id=189941 8 votes

answered by SchrA~\[Paragraph]dinger's cat https://tex.stackexchange.com/landing/r/digest?cta=user&id=194703 12 votes