This is the first @desmos.com Notebook I started working on, and I've been tweaking it for a while. It guides the reader through a derivation of the Law of Sines and provides some worked examples. Suggestions appreciated. #mtbos #iteachmath #mathstoday #mathsky www.desmos.com/notebook/mxy...

Law of Sines

desmos.com

Quick question: is there a write-up anywhere describing *how* Claude Fable was able to find its counter-example to the Jacobian Conjecture? Presumably it wasn’t pure brute-force search, as the space would have been too huge. I’m not seeing anything about that how-part on the Wikipedia page yet.

I wrote about how @hpicciotto.bsky.social makes such wonderful (and useful) mathematical activities. substack.com/home/post/p-...

How Henri Picciotto Designs Great Lessons

Learning from one of the best to ever do it.

substack.com

Desmos now includes a version history! 🎉🥳 Thank you, @desmos.com ! This has been on a lot of users' wish-lists for a long time. #iTeachMath

Some great math-themed stuff in here too!

Andy Hall@testtubegames.com · 3mo ago

I host a website with a bunch of links to science games/simulations all across the web. Last month I noticed a spike in traffic... checked, and indeed - science AP tests had just wrapped up. Ha. So for any beleaguered teachers who don't know about it yet... thescienceplayground.com

It’s the Klee painting from the cover of Dennett’s “Consciousness Explained”. But the colours in the real thing are very different from how they look on the book cover. Maybe they are painted in figment.

What is the whole odyssey if not a penelope cruise

The new @desmos.com notebook tool looks like it could be very powerful. More importantly, it looks like it will be lots of fun to play with. #iTeachMath youtu.be/Lv0MRBIeBTE?...

Getting Started with Desmos Notebook

YouTube video by Desmos

youtu.be

The complex plane colored by the argument of a polynomial. Each root drifts along a tiny orbit and the color vortices follow: every swirl is a zero. Made with #python #numpy #matplotlib in a @marimo.io notebook.

I was playing around in @desmos.com Geometry with triangles that share the same nine-point circle, and I accidentally made a pretty pattern. www.desmos.com/geometry/mk3... #iTeachMath #MathSky

Singing in the @momath.bsky.social Open Set evening of math songs. "Imagine All the Numbers (Having a Square Root)": a song about imaginary numbers, to the tune of John Lennon's "Imagine". The whole event was a lot of fun! www.youtube.com/watch?v=EWCe... #MathSky #iTeachMath #MTBoS

MoMath Open Set 2026: "Imagine All the Numbers (Having a Square Root)"

YouTube video by Aha, That Makes Sense

youtube.com

Here's a math music video, with animations made in @desmos.com. "Imagine All the Numbers": a song about imaginary numbers, to the tune of Imagine by John Lennon. I hope you enjoy it! I'll be singing it at MoMath in their Open Set math song event. #iTeachMath #MTBoS www.youtube.com/watch?v=pOag...

Imagine All The Numbers (Having a Square Root)

YouTube video by Aha, That Makes Sense

youtube.com

Three Houses https://www.metmuseum.org/art/collection/search/483148

What an astonishing thing to discover

David Grimm@david-grimm.bsky.social · 7mo ago

The find promises new insights into one of the most famous ideological transitions in the history of science: the moment when Earth was thrust from the center of our universe. Cool story by @joshuasokol.bsky.social for @science.org

Sad to see that trinket.io will be shutting down in August 😥. It's great for running Python Turtle online. Their website recommends switching to Pickcode, but their free version doesn't support turtle. CodeHS looks more promising (@codehs.bsky.social). Here's an example: codehs.com/sandbox/raje...

The 2025 Desmos Art Contest gallery is now live 📣! Filter by feature and find your new favorite graph at desmos.com/art 🎨 #mathsky #iteachmath #mathart

Went tidepooling today. Saw the best octopus.

Sunrise over chunks of ice floating in the East River

Here's an animation of Steiner's porism, made in @desmos.com Geometry. en.wikipedia.org/wiki/Steiner... In case they are useful to anyone, this graph contains reusable Desmos functions for doing circle-inversion of points, lines and circles. www.desmos.com/geometry/xkq... #iTeachMath #MathSky

#genuary 2: 12 principles of animation. Here's some anticipation and overshoot done in a p5.strands shader. #p5 #p5v2 openprocessing.org/sketch/2838235

Born #OnThisDay in 1887 was Indian mathematician Srinivasa Ramanujan. Despite having almost no training in mathematics, he is regarded as one of the greatest mathematicians of all time. He became one of the youngest Fellows in the Royal Society's history when he was elected in 1918 at the age of 31.

Possibly a fun activity for before Winter Break: a snowflake maker in @desmos.com (By the way, this is an old graph. It would be much easier to make in the new Geometry tool, but it might be interesting to see the trig in the Graphing Calculator). #iTeachMath #MathSky www.desmos.com/calculator/c...

Ooh, the new split-view option for Chrome tabs is quite handy! lifehacker.com/tech/google-... Right now I'm typings Qs for a scaffolded math quiz into a Google Doc, with a split-view Desmos graph by its side in the same tab. Much easier than juggling separate windows with their borders and overlaps

@desmos.com This looks like it's a bug? I'll e.mail it to support@desmos.com too. www.desmos.com/calculator/m...

Sunrise over Queens

I haven't been very active here for several months, because I've been working on a new book. Soon I will be able to tell you about it. Is anyone out there interested?

10th-Grade Prodigy Studying Mathematics At 10th-Grade Level https://theonion.com/10th-grade-prodigy-studying-mathematics-at-10th-grade-l-1819577209/

@jeremydenk.bsky.social I just started listening to your book Every Good Boy Does Fine, and was immediately captivated by your description of listening to K364 as a boy. I was just like that (apart from the whole going on to be a virtuoso thing 😀). For me, the middle mvt of 364 did it. More so: K488

Lava erupts from Hawaii's Kilauea volcano. One of the most active volacanoes in the world has started erupting. Kilauea, on Hawaii's Big Island, is spewing large columns of lava into the air. Kilauea is one of six active volcanoes located in the Hawaiian Islands

Sunday night seems the right time to post a gallery of (I hope!) every one of Catriona's geometry puzzles. notes.mathforge.org/notes/publis... Give it a moment to load ... there's a *lot* of them! #GeometryPuzzles #UKMathsChat #mathsky