7.54.3 Can you answer these questions?

7.54.3.1 Controlling the space between lines of an Array environment

https://tex.stackexchange.com/landing/r/digest?cta=question&id=612588

I have an array enviroment in which the various lines are matrices. A simple example is 
\begin_inset Formula 
\begin{align*} 
A & =\left[\begin{array}{cc} 
a & b\\ 
c & d 
\end{array}\right]\\ 
... 
[lyx] [arrays] [phantom]
 

asked by Thomas Philips https://tex.stackexchange.com/landing/r/digest?cta=user&id=136135 1 vote

7.54.3.2 latex-generated PDF has errors in Adobe Acrobat even though it opens fine in the Chrome PDF viewer and Mac OS X Preview

https://tex.stackexchange.com/landing/r/digest?cta=question&id=612281

I've generated the following PDF using pdflatex: 
https://ofir.io/train_short_test_long.pdf 
It can be viewed perfectly fine if opened in the Chrome PDF viewer or in Preview in Mac OS X, but if I open ... 
[graphics] [pdftex] [luatex] [adobe] [acrobat]
 

asked by Ofir P https://tex.stackexchange.com/landing/r/digest?cta=user&id=230678 1 vote

7.54.3.3 Add only subsections under current section to the section page in metropolis theme at beginning of sections

https://tex.stackexchange.com/landing/r/digest?cta=question&id=612269

I'd like to add the list of all subsections in the current section to the section page at the beginning of each section. I am using the metropolis theme. I did some research and found a way to do so ... 
[beamer] [table-of-contents] [sectioning] [beamer-metropolis]
 

asked by hurrikale https://tex.stackexchange.com/landing/r/digest?cta=user&id=249948 1 vote