12.5.1 Top new questions this week

12.5.1.1 Are there any tips/tricks to improve simplification of this flavor of expression in Wolfram Engine?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=318565

I've been using Wolfram Engine 14.3 for a personal project, and a common problem I've encountered is that its outputs  even after using  Simplify[] , ... 
[simplifying-expressions] [algebraic-manipulation] [factorization]
 

asked by Lawton https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=92961 Score of 6

answered by azerbajdzan https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53172 Score of 7

12.5.1.2 Why does NDSolve drift away from a steady solution used as initial data for this PDE system?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=318549

I am struggling with the following PDE system related to my ongoing research in $(s,t)\in[0,1]\times[0,T]$ with dependent variables $x(s,t)$, $y(s,t)$, $\theta(s,t)$, $p(s,t)$. Here $(')=\partial/\... 
[differential-equations] [equation-solving] [numerics]
 

asked by YSXB https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=100188 Score of 6

answered by xzczd https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1871 Score of 4

12.5.1.3 How to calculate symmetry factor of one Feynman diagram using Mathematica?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=318531

I've been reading Srednicki's Quantum Field Theory lately. I'm wondering how to calculate symmetry factor of one Feynman diagram using Mathematica? 
Do QuCalc, QuantumUtils or any package help? 
 
... 
[graphs-and-networks] [physics] [feyncalc] [quantum-computing] [symmetry]
 

asked by Flint https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=115347 Score of 6

answered by yarchik https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9469 Score of 6

12.5.1.4 Catching sequential evaluation in ParallelMap

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=318533

The documentation of ParallelMap mentions that 
 
A function used that is not known on the parallel kernels may lead to sequential evaluation: 
 
giving this code example 
... 
[parallelization] [undocumented]
 

asked by vsht https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=20240 Score of 4

answered by Rolf Mertig https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=29 Score of 5

12.5.1.5 Reflectedness of PolyGamma depends on sum direction irrespective of Assumptions, requiring pole cancellation for combinatorial sums

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=318556

I recently wrote the page a little-known permutation generator, in which I investigated sums of products of reciprocals of coordinates over simplex-shaped regions. (These turned out to be the $r$-... 
[calculus-and-analysis] [special-functions] [summation]
 

asked by DroneBetter https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=111614 Score of 3

answered by Mariusz Iwaniuk https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26828 Score of 2

12.5.1.6 Convert a trigonometric solution with parameter to a function

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=318538

Consider the following attempt to get $x_1$ and $x_2$ as functions of $n$: 
... 
[equation-solving] [syntax]
 

asked by mf67 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=55498 Score of 3

answered by azerbajdzan https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53172 Score of 6

12.5.1.7 How do I re-define division?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=318572

For defining $0^0=1$, the following code works: 
 Unprotect[Power]; Power[0, 0] = 1; Protect[Power]; 
But what if I want to define $0/0=0$? 
The following code does not ... 
[functions] [arithmetic]
 

asked by Anixx https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=651 Score of 2

answered by Anixx https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=651 Score of 3