So, uh….. is anyone still giving take-home exams?

It’s a pretty good gag to write an ending to your novel that auto-excuses any preceding imperfections.

Don Algebraic Numbers?

Stupid idea that has been plaguing me all weekend

(Mathematical art, I guess.) Phase-shifting the Fourier transform of a regular 14-gon. Or equivalently: seven plane waves meeting at equal angles.

The Portuguese man o' war is both very weird and linguistically rich: 1) It's a siphonophore, not a jellyfish. 2) It's a colonial organism consisting of seven specialized, genetically identical zooids. 3) Plural: Portugese men o' war. 4) Collective noun: armada.

What an epoch, huh? Lemon, we’re only 75 years into the Anthropocene.

Are you interested in incorporating #PreTeXt into your courses this semester? Join the @mathtech.org drop-in today mathtech.org/events/ where we will have a special "getting started with PreTeXt" office hour! We'll be helping helping folks with the first document anyone writes, their syllabi!

I have learned how to use tikz. I am unstoppable.

Abolish ICE. Prosecute all of them.

Theorem. It’s the journey, not the destination. Proof:

How did they manage to make 42° feel like 28°?

Was someone on here discussing combinatorial interpretations of 2ˣ versus eˣ, or did I hallucinate that? We have 2ˣ = ∑ₖ (x choose k) with absolute convergence for Re(x)>0, and eˣ = ∑ₖ xᵏ/k! unconditionally. This is not quite generating functions, but feels similar, and seems to say...

The Internet Anagram Server (I, Rearrangement Servant) is the best Web 1.0 site. wordsmith.org/anagram/ -@YokelVictim

Here’s an algebraic structure: R union {infinity}, with these two binary operations: +, and x || y = 1/(1/x + 1/y). What is this? Each binary operation is independently an abelian group plus an absorbing element. But I don’t see any obvious identities involving both operations.

yeah

Half saint, half cunt: the Grothendieck-Teichmüller group.

@jsellenberg.bsky.social made a new Sudoku variant called Dyadiku, based on splitting the 8x8 grid into 8 rows, 8 columns, 8 2x4 rectangles, and 8 4x2 rectangles. It's fun, and you can play it at dyadiku.netlify.app. More about it on his blog: quomodocumque.wordpress.com/2026/01/05/d.... 🧮

This is my marathon training thread. Goal race: Eugene Marathon, April 26 Day 1: Kicked things off with a 13-mile long run along the riverfront. Pace wasn’t great but happy to be moving consistently in zone 2. strava.app.link/FTrhfSs9GZb

11-minute faculty meeting in which two committee chairs didn't show up to give reports. Can I get a 'hell yeah'?

This is a fabulous example of a non-cancellative commutative monoid. Note that its group completion is ℤ{π} and the group completion homomorphism is not injective. Now whether this monoid exists 'in nature'....

Circle back to that? And increase my winding number?

You know you've done something right with your life when a friend sends you a 20-page 5-year plan for your Russian lit book club.

😤✋ incarcerate 🦀👉 incarcinate

Teaching the 9yo circuits with Arduino. Just had a very pedantic internal debate over whether circuits “in series” are mathematical sequences or series….

Putting together slides for a talk on brevity next week and was reminded of this: one of the shortest scientific papers I know of. 1/2

*points at gyre* There’s your problem. Widening.

Might be worth reminding any AMS officers or council members you see next week #disruptJMM

And also boycott #icm2026 #mathsky

In this case, I am apparently paying the tariff and an exorbitant "storage fee" to FedEx. If any US'ians are planning international purchases, I strongly recommend using a different shipper.

lol FedEx is asking me to pay import tax on a package they already delivered. Why would I do that? Also the import tax is greater than the price of the item!

Shorts in the snow, but also never removing their coats indoors — has science studied nine-year olds’ incredible powers of homeostasis?

Bad news for all the haters out there: I’m back.

Anyway, here’s this wacky art/comic book(?) I found featuring “Euclids” which are reengineered C-3PO figurines.

If your position is that regime change should be forced on countries where the president does not respect democratic norms and regularly kidnaps opponents using an officially sanctioned paramiliatary, have I got news for you about your position on the United States

The "full wrath of American justice"??? The American judicial system is nothing but a machine for exerting political will and vengeance to these people.

Call your reps and tell them to impeach and convict.

Separately, I finally realized why the Lee Scoresby character from the series is so annoying-yet-fascinating — he’s played by Lin-Manuel Miranda!

Me this week in Santa Fe:

Happy new year! My all sky camera imaged the sky every 15 seconds and this picture shows what happened in the sky in 2025. It shows the length of the night and day with the hourglass shape, the monthly lunar cycle with the diagonal bands, the elevation of the Sun at local noon, and lots of clouds.

New year, new me. New month, new me. New week, day, hour, minute, second, new me. I am a loosely bound bundle of attributes in flux hurtling through time.

Rooted and Uprooted, Sonya Clark (b.1967)

It’s a total romp, especially the stories within stories.

How do I count rereading the same three pages of a research monograph sixty times?

New year, new me. New month, new me. New week, day, hour, minute, second, new me. I am a loosely bound bundle of attributes in flux hurtling through time.

What show should my family watch together? We just finished season 1 of His Dark Materials but the plot holes and bad acting are driving us crazy.

This almost-but-not-quite-periodic image is inspired by a recent blog post by @johncarlosbaez.bsky.social about musical scales: let me explain what I drew here, and what it has to do with music, but also with diophantine approximations of log(2), log(3) and log(5). 🧵⤵️ •1/19

Possibly even more than ok.

Did you finish the gift shop item commemorating one of the most grave and deadly moments in world history? Sure did, boss — real cute, just like you asked.

I can only wish my dreams were this entertaining. 🧵👇