9.25.3 Can you answer these questions?

9.25.3.1 Mathematica function B

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=287939

I came across this page on the Wolfram functions site: The conformal mapping from the triangle to the half plane. 
It describes a conformal map from an equilateral triangle to the upper half-plane ... 
[functions] [special-functions] [notation]
 

asked by Gragarian https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=81403 Score of 1

9.25.3.2 How can I increase boundaries accuracy in satellite images?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=288001

I use the following codes for this work on Mathematica, but they have low accuracy. I would be grateful if you could help me improve accuracy. 
 
The codes are as follows 
... 
[graphics] [image-processing]
 

asked by erfan https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=93530 Score of 1

9.25.3.3 Auxiliary variables in NDSolve. How avoid DAE

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=287884

I need to solve a system of first order differential equations that look like 
$$ 
f_1'(t)=F_1(f_1(t),...,f_n(t),g(f_1(t),...,f_n(t))),\\ 
.\\ 
.\\ 
.\\ 
f_n'(t)=F_n(f_1(t),...,f_n(t),g(f_1(t),...,f_n(t))). 
... 
[differential-equations] [equation-solving]
 

asked by ElevenBadger https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=93652 Score of 2