6.25.1 Top new questions this week

6.25.1.1 How can I reproduce this mandala with Mathematica?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=233050

I found this image on the Internet and it is very beautiful. How can I  reproduce it? 
The ideal would be to be able to control the colors of the outside as well as the center. 
[plotting] [graphics]
 

asked by Susana https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=37778 12 votes

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 32 votes

6.25.1.2 Tennis Racket theorem

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=232976

Torque-free Euler equations experiment seen in low gravity of Russian spacecraft is modelled here with a view to see its tumbling motion around the intermediate axis $\omega_2$ rotation. However its ... 
[differential-equations] [physics]
 

asked by Narasimham https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=19067 10 votes

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

6.25.1.3 Climbing/Descending the Integer Ladder

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=233096

A fun combinatoric puzzle that's popped up in my work that I think would be cute to have a Mathematica solution to, if anyone wants to give it a go. It's basically a ladder climbing/descending problem ... 
[combinatorics]
 

asked by b3m2a1 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=38205 8 votes

answered by Leonid Shifrin https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=81 5 votes

6.25.1.4 Remove inner brackets

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=233206

If I have the result 
... 
[list-manipulation]
 

asked by GlomGive https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=75305 7 votes

answered by wuyudi https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=68689 10 votes

6.25.1.5 Identify the Vertices and Lines around the edges of a free surface - Mesh/DiscreteGraphics

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=232975

To write a mesher that closes a mesh surface using an implied surface from a boundary spline curve and mesh generated using DiscreteGraphics, I need to identify the Vertices and Lines around the edges ... 
[finite-element-method] [mesh]
 

asked by mh2000 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=57215 7 votes

answered by Tim Laska https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=61809 8 votes

6.25.1.6 How can I extract the edge points from an image?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=233092

I want to extract the edge points from a text image and use   ListPlot[points]  to visualize those points: 
 
I tried to used ... 
[graphics] [image-processing]
 

asked by vito https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=30288 7 votes

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 9 votes

6.25.1.7 How to speed up integers finding function?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=232960

Playing with integers I looked for a way of finding, let's say, $4$-digits positive integers such that $a,b,a+b$ had the same digits, like $$1089 + 8019 = 9108$$ 
I am a newbie and I used this function 
... 
[performance-tuning] [function-construction]
 

asked by Raffaele https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=49764 7 votes

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 12 votes