6.34.3 Can you answer these questions?

6.34.3.1 Define an incremental counter with Lua

https://tex.stackexchange.com/landing/r/digest?cta=question&id=551799

I would like to receive a suggestion for this example. Really, it is more a question related to Lua scripting. 
Minimal working example 
\documentclass{beamer} 
\directlua{dofile("timer.lua")} 
... 
[macros] [luatex] [lua] [directlua]
 

asked by Oromion https://tex.stackexchange.com/landing/r/digest?cta=user&id=117967 1 vote

6.34.3.2 I want to type contraction of 3*3*3 matrices (the triple dot product symbol), how to write?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=551359

please help me in writing this equation in Latex 
[matrices]
 

asked by prakash choudhary https://tex.stackexchange.com/landing/r/digest?cta=user&id=219295 1 vote

answered by Sebastiano https://tex.stackexchange.com/landing/r/digest?cta=user&id=117876 0 votes

6.34.3.3 using \SI of siunitx as value in \TextField of hyperref to format number in specific locale

https://tex.stackexchange.com/landing/r/digest?cta=question&id=551506

I want to use \SI as value in \TextField. The code 
\documentclass{article} 
\usepackage[ngerman]{babel} 
\usepackage[bookmarks=false]{hyperref} 
\usepackage{siunitx} 
\sisetup{locale = DE} 
... 
[hyperref] [siunitx]
 

asked by Michael Banucu https://tex.stackexchange.com/landing/r/digest?cta=user&id=62830 1 vote