Lightnews — Scholar-powered news

Peter Kagey @peterkagey.com · 14h

Made poutine tonight to celebrate 🇨🇦

1

Peter Kagey @peterkagey.com · 3d

Fixed both of them—thanks for letting me know!

Reposted by Peter Kagey

Greg Pak @gregpak.net · 11d

If you work for ICE, you should quit.

11 120 730

Peter Kagey @peterkagey.com · 5d

Triangle read by rows giving Whitney numbers [of the second kind] T(n,k) of Fibonacci lattices.

en.wikipedia.org/wiki/Matroid...

OEIS Parity Triangles @oeistriangles.peterkagey.com · 5d

OEIS sequence A079487 by N. J. A. Sloane (January 2003).

(Even terms are drawn as dark hexagons and odd terms are drawn as light hexagons.)

1 3

Reposted by Peter Kagey

Dave Richeson @divbyzero.bsky.social · 5d

There's a nice article by Siobhan Roberts about the Bridges 2025 conference in Eindhoven in the NY Times. I can now say that I am in The NY Times! (A photo credit for the shot of Chaim Goodman-Strauss and Edmund Harriss,... but still!) www.nytimes.com/2025/10/10/s...

Every Artist Has a Favorite Subject. For Some, That’s Math.

www.nytimes.com

1 10 29

Reposted by Peter Kagey

Matthew Scroggs @mscroggs.co.uk · 9d

Amazing: due to github.com/python/cpyth..., once you've updated to Python 3.14, you can use the command πthon to run your code

1 2 3

Peter Kagey @peterkagey.com · 9d

I was curious how many New Yorkers lived Upstate, so I looked on Wikipedia. The ratio of (population of NYC metro area)/(population of NY state) is (19940274)/(19867248)=1.00368, with a population of just -73026 people in Upstate New York.

1 3

Reposted by Peter Kagey

Dr. Martin Skrodzki @msmathcomp.bsky.social · 10d

The #illustratingMath Seminar Online returns on Friday, October 10th, 9 am Pacific / 12 pm Eastern / 6 pm Europe. @3blue1brown.com will be "Exploring Zeta Function Visualizations." Gabriel and Jim will provide some "Show and Ask" input. See you online on Friday!

A dark-themed event poster titled "EXPLORING ZETA FUNCTION VISUALIZATIONS." The poster includes an abstract about visualizing the Riemann Zeta function. A colorful, three-dimensional plot of a mathematical function dominates the right side. The bottom features a circular photo of the presenter, Grant Sanderson from 3Blue1Brown. The event is scheduled for Friday, October 10, with times listed, and will be held on Zoom.

4 7

Peter Kagey @peterkagey.com · 10d

I just re-designed my website away from Wordpress so that I could more easily embed 3D objects, Javascript, and more.

Check out my first blog post that takes advantage of these new features, based on a Bluesky post that I made back in May.

Pentagonal icositetrahedron puzzle

A puzzle on the faces of the pentagonal icositetrahedron with 3D models, STL files, photos, and video illustrations

peterkagey.com

1 4 20

Peter Kagey @peterkagey.com · 10d

Sure thing! I wrote a blog post just for you which includes links to the STL files.

Pentagonal icositetrahedron puzzle

A puzzle on the faces of the pentagonal icositetrahedron with 3D models, STL files, photos, and video illustrations

peterkagey.com

1 1 2

Reposted by Peter Kagey

nanma80.bsky.social @nanma80.bsky.social · 12d

Two puzzles I'm building:
🔴 12 pieces slide into a cube with coordinated motions in 2D abstract space.
🔵 30 pieces form a dodecahedron with 4D motions.
Inspired by John Kostick's designs. john-kostick.github.io/vzome-sharin...

2 9 14

Reposted by Peter Kagey

χle Ormsby @motivickyle.bsky.social · 17d

The k-th entry of the n-th row here is (n^4 % k) % 2 with 0 colored dark blue and 1 colored light blue.

OEIS Parity Triangles @oeistriangles.peterkagey.com · 17d

OEIS sequence A049763 by Clark Kimberling.

(Even terms are drawn as dark hexagons and odd terms are drawn as light hexagons.)

1 1 5

Peter Kagey @peterkagey.com · 17d

Another bonus one, because I forgot to turn of the scheduler on my local machine! 😉

Peter Kagey @peterkagey.com · 18d

Extra bonus triangle today, because I'm moving the bot from running locally on my machine to my VPS.

(It's a cute coincidence that it's from the late Reinhard Zumkeller, because he played a role in my early contributions to the OEIS and is part of the reason I'm a math professor today.)

2

Peter Kagey @peterkagey.com · 21d

Today in the NYT

Exploring Barcelona's Architecture Through a Mathematical Lens (Gift Article)

A virtual tour of the architecture in a city where mathematics and exploration meet.

www.nytimes.com

1 1

Reposted by Peter Kagey

CMU Mellon College of Science @cmuscience.bsky.social · Sep 4

CMU students and math artist Glen Whitney created “Knight’s Move,” an 8-foot sculpture on Wean Hall’s patio. Representing 288 knight moves on a 3D chessboard, it’s a bold mix of math and art. Check it out this fall!
www.cmu.edu/mcs/news-eve...

A student holds up a sculpture made of yellow, red and gold strips of metal.

5 18

Peter Kagey @peterkagey.com · Sep 13

@scottvorthmann.bsky.social

Reposted by Peter Kagey

John Golden @johngolden.bsky.social · Sep 12

Just heard of vZome for the first time. www.vzome.com/app/ #mathapp seems great.

vZome

A design application for Zometool and similar geometric systems

www.vzome.com

1 1 11

Reposted by Peter Kagey

Dan Piponi @dpiponi.mathstodon.xyz.ap.brid.gy · Aug 29

My first OEIS entry: https://oeis.org/A387361

2 3 8

Reposted by Peter Kagey

Joseph O'Rourke @josephorourke.bsky.social · Aug 27

The conjecture that every convex polyhedron is Rupert is settled in the negative! The convex body in the image cannot pass straight through a hole inside itself.
arxiv.org/abs/2508.18475
#Mathematics #Geometry #MathSky

1 9 37

Peter Kagey @peterkagey.com · Aug 23

Minimum number of integer-sided squares needed to tile an m X n rectangle.

OEIS Parity Triangles @oeistriangles.peterkagey.com · Aug 22

OEIS sequence A219158 by David Radcliffe (November 2012).

(Even terms are drawn as dark hexagons and odd terms are drawn as light hexagons.)

2 5

Peter Kagey @peterkagey.com · Aug 22

😍

1 1

Peter Kagey @peterkagey.com · Aug 22

Keep going! You're almost to infinity!

1 1

Peter Kagey @peterkagey.com · Aug 21

A Mathematica demo I made of wandering around a parameter space of the convex hull of various scalings the vertices of a icosahedron, dodecahedron, and icosidodecahedron.

Given the right parameters, we can recover all Platonic and Catalan solids with full icosahedral symmetry.

2 7 18

Peter Kagey @peterkagey.com · Aug 20

I can tell you first-hand that this is a terrific department to work in! (Not least because @dyong.bsky.social is a world-class colleague!)

Darryl Yong (he/him/his) @dyong.bsky.social · Aug 20

Friends, the mathematics department @hmc.edu is looking to hire a new tenure-track operations researcher who would feel at home in our department. Please spread the word: math.hmc.edu/tenure-track...

3