11.39.1 Top new questions this week

11.39.1.1 How are people using the Notebook Assistant and how useful is it?
11.39.1.2 How to specify Showcase styling
11.39.1.3 Is it valid for DSolve to return Indeterminate as a solution to a differential equation?
11.39.1.4 How to define a matrix to be positive definite and symmetric?
11.39.1.5 Is there an equivalent of Exponent for difference equations?
11.39.1.6 How to Simplify 'unordered' lists of expressions
11.39.1.7 Cut a thick arc (sector of annulus)
11.39.1.1 How are people using the Notebook Assistant and how useful is it?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=316996

This is more of a community question than an answerable problem.  If it's out of bounds I'll be happy to withdraw it.  But, one year out, I'm curious as to other WL users' experiences with the ... 
[notebooks] [notebook-assistant]
 
asked by Tom Barson https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=84497 Score of 17
answered by Lexington1776 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=87913 Score of 14
11.39.1.2 How to specify Showcase styling

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=316955

I generated a mesh region and noticed in the notebook image pull-down menu the option for 
"Showcase styling." How can I request this styling (gold sphere vertices, silver tube edges) for ... 
[graphics3d] [regions] [mesh]
 
asked by Joseph O'Rourke https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=194 Score of 6
answered by Greg Hurst https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=4346 Score of 9
11.39.1.3 Is it valid for DSolve to return Indeterminate as a solution to a differential equation?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=317004

In V 14.3 
 Quit[] 
 
ode=2*y[x]*D[y[x],{x,2}]==1+D[y[x],x]^2; 
DSolve[ode,y[x],x,IncludeSingularSolutions->True] 
 
Gives 
 
Is it valid for DSolve to return ... 
[differential-equations] [calculus-and-analysis]
 
asked by Nasser https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70 Score of 5
answered by azerbajdzan https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53172 Score of 4
11.39.1.4 How to define a matrix to be positive definite and symmetric?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=316973

I'm somewhat new to Mathematica and want to check symbolic solutions to small positive definite symmetric matrices (like 3x3 in size), which I think should in general yield a symbolic solution since ... 
[matrix]
 
asked by shangjiaxuan https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=62042 Score of 5
answered by Daniel Huber https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=46318 Score of 4
11.39.1.5 Is there an equivalent of Exponent for difference equations?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=316961

[Edited.] 
For $ax^{2}+bx+c$, I can write 
 poly = a x^2 + b x + c; 
Exponent[poly, x] 
 
and get back  2 . 
I don't see a built-in ... 
[difference-equations]
 
asked by Tom Barson https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=84497 Score of 5
answered by azerbajdzan https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53172 Score of 4
11.39.1.6 How to Simplify 'unordered' lists of expressions

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=317002

Say I have a list containing some expressions, for instance 
... 
[list-manipulation] [simplifying-expressions] [sorting]
 
asked by eddy ardonne https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=84296 Score of 4
answered by azerbajdzan https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53172 Score of 3
11.39.1.7 Cut a thick arc (sector of annulus)

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=316992

I have a thick arc (or it can be represented as sector of annulus), just a very simple example: 
... 
[graphics] [regions]
 
asked by LittleCat1 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=90646 Score of 4
answered by azerbajdzan https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53172 Score of 6