8.27.3 Can you answer these questions?

8.27.3.1 How to change an environment in its body

https://tex.stackexchange.com/landing/r/digest?cta=question&id=641994

I have the below code. 
\documentclass{article} 
\newcounter{ex} 
\newenvironment{ex}{% 
\par\noindent\refstepcounter{ex}{\bfseries Ex \theex.\, } 
}{} 
\... 
[macros] [environments] [renewcommand]
 

asked by Nam Tran Le https://tex.stackexchange.com/landing/r/digest?cta=user&id=193916 Score of 1

answered by pascal974 https://tex.stackexchange.com/landing/r/digest?cta=user&id=263375 Score of 0

8.27.3.2 Use of equation \(...\) versus \[...\] in latex documents

https://tex.stackexchange.com/landing/r/digest?cta=question&id=641762

I cannot understand when to use \(...\) versus \[...\].  Are there general rules on which to use? 
[equations]
 

asked by Ephram https://tex.stackexchange.com/landing/r/digest?cta=user&id=268965 Score of 1

8.27.3.3 Can footmisc do repetitive footnote markers?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=641922

I tried to provide an answer to Use Greek alphabet as Footnote labels about having Greek letters as footnote markers. Fortunately someone else gave an excellent answer while I was still working on ... 
[footnotes] [footmisc]
 

asked by Peter Wilson https://tex.stackexchange.com/landing/r/digest?cta=user&id=12082 Score of 1