6.33.1 Top new questions this week

6.33.1.1 These PDE's no longer evaluate in version 12.2 as they did under 12.1. What can be done to make them evaluate under 12.2?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=236895

These 399 PDE's no longer produce result under Version 12.2 on windows.  DSolve  now returns unevaluated.  These all evaluated under version 12.1. 
Why is that? And ... 
[differential-equations] [version-12.2]
 

asked by Nasser https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70 17 votes

answered by Devendra Kapadia https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=18617 12 votes

6.33.1.2 Travelling around Jupiter

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=236843

Since we have soon historical conjunction of Jupiter and Saturn  I have prepared code with visualization planet Jupiter and Saturn with moons. This code first been prepared for version 11.3 and with ... 
[plotting] [astronomy]
 

asked by Alex Trounev https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=58388 16 votes

6.33.1.3 Numerically evaluating parameter derivatives of a hypergeometric function

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=237032

I am unable to obtain the numerical value of the derivative of the hypergeometric function. Please note that the (2,4,0,0) is the derivative with respect to the first and second argument 
... 
[numerics] [special-functions]
 

asked by Sachin Kaushik https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=58727 7 votes

answered by Mariusz Iwaniuk https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26828 7 votes

6.33.1.4 Numeric Solution Hydrogen Atom

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=236980

I'm trying to solve the Schrödinger equation for the hydrogen atom without made the variable separation of the polar and radial coordinate. It is my test code to extrapolate to another system with its ... 
[differential-equations] [finite-element-method] [physics] [eigenvalues]
 

asked by Jorge Castaño https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=73029 7 votes

answered by Jorge Castaño https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=73029 0 votes

6.33.1.5 Sum cause a Recursion problem

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=236934

 Sum[((-1)^(i + 1)*Binomial[n, i]*(n - i)!)/n!, {i, 1, n}] 
 
This cause a Recursion problem. 
 
As the comment said, If simplify the formula and then sum it, problem ... 
[bugs] [summation] [recursion]
 

asked by wuyudi https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=68689 6 votes

6.33.1.6 Is it possible to ask Mathematica to give the maximum value of a function over a specific domain?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=236971

I have a function $f(n)$ over $n\in\mathbb{N}$. I want to know its maximum value over a very large domain, say $n=1,2,3,4,...,10^6$. Is there a way to ask Mathematica to give me the maximum value of ... 
[numerics] [numerical-value] [maximum]
 

asked by charmin https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=74550 6 votes

answered by MarcoB https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=27951 9 votes

6.33.1.7 Unrolling a surface

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=237045

The surface is determined by this parametric equation 
 ParametricPlot3D[{Cos[],Sin[],z(2+ Cos[])},{,-Pi,Pi},{z,0,1}] 
 
 
How to unfold the surface in Mathematica? ... 
[plotting] [function-construction] [animation]
 

asked by expression https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=7339 5 votes

answered by Tim Laska https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=61809 3 votes