Check out my recent @mathtech.org post showcasing opportunities to get involved with Doenet.org including a funded workshop June 1-5!

"My tshirt raises many questions already answered by my tshirt."

This is high quality lemonade making.

FUCK YEAH

Comprehensive presentation of the "Theorem of the Day", starting with a statement of this theorem : The Ollerenshaw–Brée Formula.

Theorem of the Day (April 20, 2026) : The Ollerenshaw–Brée Formula
Source : Theorem of the Day / Robin Whitty
pdf : buff.ly/fRZ34oe
notes : buff.ly/4PBbU2x

#mathematics #maths #math #theorem

This is the right decision and very welcome news. Working to make digital accessibility a requirement of public institutions is important and correct, but the one year extension will allow everyone to do things "right" rather than rush into compliance.

If you guys teach at the same time, maybe switch classes for one day and see how long it takes the class to notice?

Frozen dumplings because too lazy to cook.

Equivariance, damn you autocorrect!!

Although, hilariously, every non-mathematics professor asked about applications, and apparently my answer of “it helps homotopy theorists understand equivalence of N_infinity Operads…..somehow” was not very satisfying 🤣.

Two students presenting a math poster to a group of biologists.

Two students to present their math poster to a psychologist.

Two students present their research to fellow students while a mathematician looks on.

Two students pose with their poster and advisor.

Oxford College Research Scholars Symposium today!

My mom had me count to 20 by, you know, actually asking me to do that.

My “the signs were there early” moment was: we used to be asked to say our A,B,Cs and 1,2,3’s. ABCs made sense because there was a well defined endpoint, 123s did not, so I would only say “123”. My mom got called in, since the school was convinced I was mentally delayed.

By popular demand, institutional licenses can now be purchased at PreTeXt.Plus/subscriptions

Please, if you can pip install things, don't pay money for open source products! But if your office mate just wants to Start Writing, we're here to help! Basic/free tier is pretty good too... #MathSky

Display case with my picture, linear optimization book and paper with student.

Faculty Showcase today!

Getting started with Pretext slide with picture in picture of David Farmer

Lots of cool work being shared in the @amermathsoc.bsky.social accessibility call. Of course, here's my favorite. PreTeXt.Plus

Tutte’s counterexample to Tait’s conjecture

Tait thought all 3-conn 3-regular planar graphs were Hamiltonian, which would have proven the Four Color Theorem. Tutte provided a counterexample.

What Edward said, but also on a scale from obviously to duh, how predictable was this?

Are you a new(ish) math professor? Know someone who is? MAA Project NExT is a fantastic way to jumpstart a career in higher ed math. Applications are due today!
maa.org/maa-project-...

I wanna read the midterm now.

Annotated Edition: "Why sex-ratios in majors might be more than just bias" Line-by-line notes on factual, logical, and rhetorical errors. Annotated by Chad M. Topaz.

Another professor wrote a campus paper piece arguing that the economics gender gap is mostly biology. This... did not survive close reading. So because I am this way, I made an interactive annotated edition cataloging the factual, logical, and rhetorical errors. Wheee... Enjoy! #EconSky #AcademicSky

I'm really happy this paper is finally out!

It's about a course I taught for many years, and it ties together lots of my favorite and most creative ideas.

It also deepens my contribution to the ongoing discussion of the nature of inquiry. [Jump to Section 3.4 for a fun image.]

…independent of applications. Thank you!

So three in mind, I was recently asked about applications of Graph coloring, and I gave an answer but something in your excellent expositional style would be great. Similarly for applications of Topology. But while we have all these applications, something about the value of mathematics…

Need to compute the adult human fundamental group of this adult human manifold.

Thanks for making these! They’re great compact videos to share with students.

The many, MANY, applications of group theory YouTube video by Alvaro Lozano-Robledo

Great short video by @mathandcobb.bsky.social on the applicability of Group Theory!

youtu.be/n_w_J48oAwU

In this continuing hilarious saga, this piece jumped from 2k views yesterday to 3.2k views at the start of today. ☠️🤣

I was like WHAT HAPPENED and turns out it got referenced/linked on RetractionWatch.com. KEEP IT UP PEOPLE. Maybe we can hit 4k today.

Help me celebrate one year since a virtual move and redesign! Through April, everything in my shop is discounted 10% with code "DG1".

www.diffgeom.com/product/harm...

#MathSky #MathArt #SciArt #Jewelry

It was so long ago, I forgot I had a story. Very minor, paper eventually was published and even won an award. Will DM you later.