10.21.3 Can you answer these questions?

10.21.3.1 I need a link to Leonid Shifrin's" MathProgrammingIntro.pdf" example code

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=304690

I have been reading and using the Shifrin text. I tried to get the example code he mentions, but his website is closed. Anyone have a link to these examples? I ask here because this seems to be the ... 
[symbolic]
 

asked by SirMath https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=90117 Score of 1

10.21.3.2 Solving partial differential algebraic equation in Mathematica

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=304683

I have been searching the documentation a lot and, while PDEs and DAEs are solved, a full multivariate PDAE system was not easy to find. I have found elliptic PDEs. 
I have 4 variables, $y_1$ through $... 
[differential-equations] [numerical-integration]
                                                                                  

                                                                                  
 

asked by Zack Fair https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=29565 Score of 1

answered by Roland F https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=92018 Score of 0

10.21.3.3 TensorExpand with Koszul signs

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=304608

I am very new in Mathematica, and I am struggling computing the multiplication of tensor products with Koszul signs. 
Let $V$ be a vector space and $a,b,c,d \in V$. In usual situations, the product of $... 
[tensors]
 

asked by Luka https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=99609 Score of 1

answered by zeraoulia rafik https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=66737 Score of 0