3.31.3 Can you answer these questions?

Can you answer these?

3.31.3.1 mathtools bug with aligned

https://tex.stackexchange.com/questions/389887/mathtools-bug-with-aligned

The following code does not compile 
\documentclass{article} 
\usepackage{mathtools} 
\DeclarePairedDelimiter\abs{\lvert}{\rvert} 
\begin{document} 
\[\aligned 
&\abs{X} 
\endaligned\] 
...
 

- asked by Tohiko 1vote

3.31.3.2 How to disable grouping for \includestandalone

https://tex.stackexchange.com/questions/390220/how-to-disable-grouping-for-includestandalone

I redefine the default macros for real and imaginary part according to 
\let\Re\relax 
\DeclareMathOperator{\Re}{Re} 
\let\Im\relax 
\DeclareMathOperator{\Im}{Im} 
Besides the main document, I'd also  ...
                                                                                  

                                                                                  
 

- asked by Casimir 1vote

3.31.3.3 Right Branch of Function Call Graph missing?

https://tex.stackexchange.com/questions/390072/right-branch-of-function-call-graph-missing

Here is the code: 
\documentclass {article} 
\usepackage {tikz} 
\usetikzlibrary {positioning} 
\definecolor {turboviole}{cmyk}{0.70,0,0,0} 
\begin {document} 
\begin {center} 
\begin {tikzpicture}[-latex  ...
 

- asked by Ziezi 1vote

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