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11.41.3 Can you answer these questions?

11.41.3.1 Neural Networks and Non Linear Fits
11.41.3.2 Pick up the positive solution from Solve
11.41.3.3 Summation contains additional $\frac \zeta(3)  8\pi^2 $ term if evaluated without presimplification
11.41.3.1 Neural Networks and Non Linear Fits

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=317083 

I'm trying to obtain the parameter models for various types of acoustic absorption materials. 
When dealing with fiber (polyester, with low flow resistivity), the Wilson model, which has two parameters,... 
[linear] [neural] [networks] [non]
asked by Teodoro Marinucci https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=52169 Score of 1
11.41.3.2 Pick up the positive solution from Solve

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=317085 

... 
[equation-solving]
asked by metroidman https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=94488 Score of 1
11.41.3.3 Summation contains additional $\frac \zeta(3)  8\pi^2 $ term if evaluated without presimplification

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=317114 

As noted in this math.se question from 2018 (which was using WolframAlpha and Mathematica 7.0, though it persists in 14.0.0), Mathematica's evaluation of the following sum depends on where the ... 
[simplifying-expressions] [summation]
asked by DroneBetter https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=111614 Score of 1

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