7.22.3 Can you answer these questions?

7.22.3.1 four-dimensional Levi-Civita

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=250232

Consider we have these four vectors  $p^{\mu}$, $q^{\nu}$, $k^{\rho}$, and $k'^{\sigma}$. 
How can we calculate 
$$ 
\epsilon_{\mu\nu\rho\sigma} p^{\mu} q^{\nu} k^{\rho} k^{\sigma}$$ 
in Mathematica, ... 
[tensors] [wolfram-physics]
 

asked by zari https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=80742 1 vote

7.22.3.2 "Total" function for a Boolean expression

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=250318

I have a very long vector of the form 
... 
[list-manipulation] [replacement] [boolean-computation] [replacing]
 

asked by AlbaCL https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=79527 1 vote

7.22.3.3 How to run wolfram code from the finder in macos?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=250390

I'd like to run wolfram code (probably a .wls script) on a file or set of files by selecting them in the finder and using  Right-click > Services . 
For example, ... 
[files-and-directories] [scripting] [mac-os-x] [external-calls] [system]
 

asked by M.R. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=403 2 votes