6.67.1 Top new questions this week

6.67.1.1 How to define a new triangle symbol with middle line for use as a maths operator?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=571782

I would like to use a specific symbol, a triangle with a middle line, as a mathematical operator. Here is roughly how the symbol ought to look like: 
[This was generated with tikz by appropriating the ... 
[math-mode] [symbols] [math-operators] [definition]
 

asked by Linear Christmas https://tex.stackexchange.com/landing/r/digest?cta=user&id=116907 10 votes

answered by campa https://tex.stackexchange.com/landing/r/digest?cta=user&id=82917 10 votes

6.67.1.2 Using the \int_step_function

https://tex.stackexchange.com/landing/r/digest?cta=question&id=571627

Consider the following MWE: 
\documentclass[letterpaper]{article} 
\usepackage{l3draw} 
\ExplSyntaxOn 
\NewDocumentCommand{\miconcentric}{ O{0.08ex} } 
{ 
\mathicon_concentric_circles:n { #1 } 
} 
... 
[latex3] [xparse] [l3draw]
 

asked by azetina https://tex.stackexchange.com/landing/r/digest?cta=user&id=10898 7 votes

answered by Phelype Oleinik https://tex.stackexchange.com/landing/r/digest?cta=user&id=134574 8 votes

6.67.1.3 What is the technical reason for the difference of $\sum  ^ ... $ and $\sum^ ... $?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=571928

Because space is a delimiter when parsing macro names, I got used to ending macros in running text with {} like in text \foobar{} text, because I find the escaped space in text \foobar\ text ... 
[macros]
 

asked by apriori https://tex.stackexchange.com/landing/r/digest?cta=user&id=85123 6 votes

answered by wipet https://tex.stackexchange.com/landing/r/digest?cta=user&id=51799 9 votes

6.67.1.4 How to put the dots in the centre?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=571777

\documentclass[10pt,a4paper]{article} 
\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc} 
\usepackage{amsmath} 
\usepackage{amsfonts} 
\usepackage{amssymb} 
\usepackage{graphicx} 
\begin{document} 
A+... 
[pdftex] [align]
 

asked by Math_Freak https://tex.stackexchange.com/landing/r/digest?cta=user&id=192267 6 votes

answered by campa https://tex.stackexchange.com/landing/r/digest?cta=user&id=82917 4 votes

6.67.1.5 Use of two aligned environments inside an align environment

https://tex.stackexchange.com/landing/r/digest?cta=question&id=571956

I am trying to get two sets of displayed formulas, each pair of them with only one equation number using the aligned environment inside an align environment and with the additional requirement of an ... 
[align]
 

asked by F Zaldivar https://tex.stackexchange.com/landing/r/digest?cta=user&id=229442 5 votes

answered by campa https://tex.stackexchange.com/landing/r/digest?cta=user&id=82917 4 votes

6.67.1.6 LuaTeX: Mark math boundaries without affecting typeset output (both form and whitespace)

https://tex.stackexchange.com/landing/r/digest?cta=question&id=571749

As seen from answers to my previous question, math boundary nodes are not a reliable way of marking math boundaries. There are two possible workarounds that can be used to mark boundaries: 1) Add ... 
[math-mode] [luatex] [tex-core]
 

asked by reportaman https://tex.stackexchange.com/landing/r/digest?cta=user&id=192717 5 votes

answered by Marcel KrA~\274ger https://tex.stackexchange.com/landing/r/digest?cta=user&id=80496 7 votes

6.67.1.7 Why is \nsim thicker than \sim?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=571806

Problem 
For some reason, \nsim looks like a negated bold version of \sim, while I would expect it to look exactly like \sim with a slash on top of it. 
Examples 
This seems to happen with mathdesign: 
\... 
[amssymb] [mathdesign]
 

asked by Jukka Suomela https://tex.stackexchange.com/landing/r/digest?cta=user&id=100 5 votes