9.10.3 Can you answer these questions?

9.10.3.1 How to rotate text in user coordinate system?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=282294

Applying  Rotate  to text rotates it relative to the Cartesian page coordinates. I want it rotated relative to the current user coordinate system. As a simple ... 
[graphics] [annotation]
 

asked by Alan https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=19530 Score of 1

answered by IAmANaïf https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=90422 Score of 0

9.10.3.2 How to avoid spaces before parenthesis in DisplayFormula cells?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=282259

When I write a formula in a DisplayFormula or DisplayFormulaNumbered cell, I like to use "traditional notation", i.e. function-parenthesis-argument instead of function-squarebracket-argument.... 
[formatting] [stylesheet] [display]
 

asked by JEM_Mosig https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=35390 Score of 1

answered by Alexei Boulbitch https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=788 Score of 0

9.10.3.3 Periodic boundary condition conflicts with DirichletCondition?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=282416

I want to solve a simple diffuse equation in a cylinder. 
$\nabla\cdot(\hat{c}\nabla\rho_P=0$ 
$\rho_P(x,y,\theta)==0,\sqrt{x^2+y^2}=R$ 
$\rho_P(0,0,\theta)==1,\sqrt{x^2+y^2}=0$ 
$\rho_P(x,y,2\pi)=\rho_P(... 
[differential-equations] [finite-element-method]
 

asked by  https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=87528 Score of 1