iiinova — where your digital self keeps evolving

Raj Raizada @rajraizada.bsky.social · 01/10/2026

Proper support for matrices in @desmos.com is now live in the graphing calculator, geometry tool and 3D grapher!! 🎉 Here is something I was playing with in the beta-testing period: Regression using matrix pseudo-inverse www.desmos.com/calculator/1... #iTeachMath www.youtube.com/watch?v=qpkS...

youtube.com

Matrices in Desmos

YouTube video by Desmos

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Carl Brandt Long @carlblong.bsky.social · 28/07/2026

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...

desmos.com

Law of Sines

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Raj Raizada @rajraizada.bsky.social · 20/07/2026

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.

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Michael Pershan @mpershan.bsky.social · 07/07/2026

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

substack.com

How Henri Picciotto Designs Great Lessons

Learning from one of the best to ever do it.

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Raj Raizada @rajraizada.bsky.social · 20/06/2026

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

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Raj Raizada @rajraizada.bsky.social · 11/06/2026

Some great math-themed stuff in here too!

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Raj Raizada @rajraizada.bsky.social · 30/05/2026

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.

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Dan Davies @dsquareddigest.bsky.social · 15/05/2026

What is the whole odyssey if not a penelope cruise

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Raj Raizada @rajraizada.bsky.social · 22/05/2026

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?...

youtu.be

Getting Started with Desmos Notebook

YouTube video by Desmos

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Simone Conradi @sconradi.bsky.social · 26/04/2026

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.

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Raj Raizada @rajraizada.bsky.social · 18/04/2026

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

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Raj Raizada @rajraizada.bsky.social · 15/04/2026

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

youtube.com

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

YouTube video by Aha, That Makes Sense

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Raj Raizada @rajraizada.bsky.social · 08/04/2026

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...

youtube.com

Imagine All The Numbers (Having a Square Root)

YouTube video by Aha, That Makes Sense

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Emily Lakdawalla 🏳️‍⚧️ Uranus Expert @elakdawalla.bsky.social · 27/02/2026

What an astonishing thing to discover

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Raj Raizada @rajraizada.bsky.social · 15/02/2026

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...

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Desmos Studio @desmos.com · 06/02/2026

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

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Kayce Bell @kaycebell.bsky.social · 01/02/2026

Went tidepooling today. Saw the best octopus.

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Raj Raizada @rajraizada.bsky.social · 28/01/2026

Sunrise over chunks of ice floating in the East River

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Raj Raizada @rajraizada.bsky.social · 12/01/2026

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

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Dave Pagurek @davepagurek.com · 02/01/2026

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

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The Royal Society @royalsociety.org · 22/12/2025

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.

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Raj Raizada @rajraizada.bsky.social · 16/12/2024

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...

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Raj Raizada @rajraizada.bsky.social · 12/12/2025

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

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Raj Raizada @rajraizada.bsky.social · 05/12/2025

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

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Steven Strogatz @stevenstrogatz.com · 17/11/2025

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?

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The Onion @theonion.com · 13/11/2025

10th-Grade Prodigy Studying Mathematics At 10th-Grade Level theonion.com/10th-grade-prodigy-stu…

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Raj Raizada @rajraizada.bsky.social · 17/11/2025

@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

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AFP News Agency @en.afp.com · 10/11/2025

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

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Andrew Stacey @mathforge.org · 16/11/2025

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

notes.mathforge.org

Puzzle Gallery in Notes

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Graph Time with Sara and Sean @graphtimesarasean.bsky.social · 14/11/2025

Hey all! We've got a new episode of Graph Time with Sara and Sean for you today! Sara and I were playing with some graphs and discovered a really fun way to create tons of beautiful mathematical patterns. Check out the episode: www.youtube.com/watch?v=7v0J...

youtube.com

Discovering Beautiful Mathematical Patterns

YouTube video by Graph Time with Sara & Sean

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Raj Raizada @rajraizada.bsky.social · 10/11/2025

An acronym to help my Geometry students, when trying to solve a problem: STACK, which stands for Similar Triangles Are Consistently Key I had suggested STATA, for "Similar Triangles Are The Answer". But then one of my students, Victor, suggested STACK. It's much better! #iTeachMath #MathSky

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sea-saw @sea--saw.bsky.social · 06/11/2025

"Only the Sea Saw When it Sank" www.desmos.com/3d/qnjd3qwwv... #desmos #mathart #mathplay

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Raj Raizada @rajraizada.bsky.social · 31/10/2025

I'll try making some simple @desmos.com art with my students today. The only "math" part of this is the geometric dilation with a list of scale factors: the rest is just drawing with the Geometry polygon tool. So, mostly fun, but some learning too! www.desmos.com/geometry/why... #iTeachMath #MathSky

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Raj Raizada @rajraizada.bsky.social · 30/10/2025

Here's a Halloween-themed @desmos.com geometry activity, in case anyone is looking for one. Task: transform the black witch's hat onto the orange one. The first few screens use constructions, and the rest use coordinate transformations. classroom.amplify.com/activity/690... #iTeachMath #MathSky

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Raj Raizada @rajraizada.bsky.social · 29/10/2025

The new surface-colouring option in @desmos.com 3D allows a cute way of visualizing conic sections. www.desmos.com/3d/fiv5gnltdl (The option to have translucent surfaces doesn't save with the graph itself, so needs to be re-toggled on. It's important for seeing the full curves) #MathSky #iTeachMath

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Desmos Studio @desmos.com · 28/10/2025

Have you noticed a change of colors? 🍁 You can now define colors in the 3D calculator that depend directly on coordinates. 📝 Learn more in the Desmos Help Center: help.desmos.com/hc/en-us/art... #iteachmath #mathsky

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Raj Raizada @rajraizada.bsky.social · 26/10/2025

I saw this poster in NYC, and was struck by how it (unintentionally) embodies a key tension in the philosophy of free will. We tend to be determinist when forgiving people we feel sympathy for, and libertarian when criticizing views that we dislike.

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Raj Raizada @rajraizada.bsky.social · 25/10/2025

Some Halloween @desmos.com art 🎃 www.desmos.com/calculator/z... #iTeachMath #MathSky

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Mike Henry @onlyveesaz.bsky.social · 23/10/2025

New yardbird! Harris’s Hawks aren’t terribly uncommon but this is a first for our east Tucson yard ☀️🪶🌵

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Raj Raizada @rajraizada.bsky.social · 22/10/2025

Complex function domain-colouring of roots of unity, in @desmos.com Here's the graph: www.desmos.com/3d/hadt9rebbe They recently enabled colouring a surface using functions, so far only in 3D grapher. Side-effect: allows complex domain colouring, using 3D tool as a 2D one! #iTeachMath #MathSky

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Raj Raizada @rajraizada.bsky.social · 15/10/2025

Timeline palate-cleanser: some pretty geometry in @desmos.com www.desmos.com/geometry/wgp... #iTeachMath #MathSky

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Dave Richeson @divbyzero.bsky.social · 10/10/2025

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...

nytimes.com

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

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Raj Raizada @rajraizada.bsky.social · 09/10/2025

Borromean rings in @desmos.com 3D: www.desmos.com/3d/nje29p8eqp #iTeachMath #MathSky

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Raj Raizada @rajraizada.bsky.social · 06/10/2025

It looks like the Wikipedia page for Mary Brunkow got created literally just this morning, after her Nobel Prize was announced. I had heard that women in academia tend to be somewhat under-represented on Wikipedia, but this is a particularly stark example. en.wikipedia.org/w/index.php?...

en.wikipedia.org

Main public logs - Wikipedia

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robertfathauer.bsky.social @robertfathauer.bsky.social · 02/10/2025

I just finished a new website on fractal self-replicating tiles ("reptiles") based on polyominoes, polyhexes, and polyiamonds: www.mathartfun.com/fractaldiver...

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Raj Raizada @rajraizada.bsky.social · 01/10/2025

I think my geometry students will enjoy making an infinite zoom effect, using the dilation tool in @desmos.com Geometry. Here's an initial attempt. Don't stare at it for too long! 😀 www.desmos.com/geometry/x46... #iTeachMath

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Raj Raizada @rajraizada.bsky.social · 28/09/2025

Lorentz attractor in @desmos.com 3D #iTeachMath www.desmos.com/3d/mnm7duxhew

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Raj Raizada @rajraizada.bsky.social · 22/09/2025

Is this a new piece of Kenny Scharf graffiti on W 57th St? I walked past it this morning and don’t recall seeing it before.

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