5.28.1 Top new questions this week

5.28.1.1 How to create a summation symbol with a vertical bar?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=504895

I am trying to create this symbol: 
I have tryed to use this: 
\documentclass{article} 
\usepackage{mathtools} 
\makeatletter 
\newcommand{\superimpose}[2]{% 
... 
[symbols] [mathtools]
 

asked by J.Rodriguez https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=181066 15 votes

answered by egreg https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=4427 21 votes

5.28.1.2 \global variant of \csnamea^\200\246\endcsname

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=504501

Please consider the following minimal example: 
\documentclass{article} 
\tracingrestores=1 
\def\foo{\bar\foobar} 
\def\bar{\gdef\testA{blabb}} 
\def\foobar{\expandafter\gdef\csname  ... 
[tex-core] [grouping] [csname]
 

asked by Lupino https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=49486 14 votes

answered by Marcel KrA~\274ger https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=80496 18 votes

5.28.1.3 Why is it useful to change \hyphenchar?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=505214

In il2code.tex there is such text: 
%% Alternative \hyphenchar ("je-li" is no "je\hyphenchar li"). 
\chardef\extrahyphenchar=156 
\def\extrahyphens{% 
\hyphenchar\tenrm=\extrahyphenchar 
... 
[hyphenation]
 

asked by Igor Liferenko https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=70900 8 votes

answered by egreg https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=4427 5 votes

5.28.1.4 How to draw a square on cylinder?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=505043

Let be a cylinder with radius of the base circle is equal to 3 and the altitude of the cylinder is equal to 2. How  can I draw square ABCD so that A, B and C, D lie on two base circles. I tried 
... 
[tikz-3dplot]
 

asked by Thuy Nguyen https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=180726 8 votes

answered by SchrA~\[Paragraph]dinger's cathttps://tex.stackexchange.com/landing/r/newsletter?cta=user&id=194703 6 votes

5.28.1.5 How to shade a polygon with curved lines in tikz?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=504740

I am trying to shade a polygon with red curved lines as shown in the MWE. I would like to shade the curved polygon enclosed by the points (A,B,C,D), i.e., the polygon ABCD. 
MWE 
... 
[tikz-pgf] [shading]
 

asked by nxkryptor https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=72911 8 votes

answered by TorbjA~,rn T. https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=586 7 votes

5.28.1.6 Draw magnetic domain with Tikz

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=504510

I am going to draw magnetic domain for paramagnet and ferromagnet as shown in figure below with tikz package: 
Please consider the following MWE: 
\documentclass{standalone} 
\usepackage{tikz} 
... 
[tikz-pgf]
                                                                                  

                                                                                  
 

asked by A Diyanat https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=51012 8 votes

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

5.28.1.7 tikz block diagonally divided

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=504386

I'm trying to draw the following diagram: 
What I could do so far: 
The code: 
\documentclass[tikz,border=20pt]{standalone} 
\usetikzlibrary{shapes,arrows} 
... 
[tikz-pgf] [tikz-styles]
 

asked by Clecio Jung https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=192449 8 votes

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