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Inquiries-Week 3: Reflect and Rotate

Fractal Kitty — 7/3/2025

IntroductionExplore the reflection and rotation of polygons to discover the patterns that emerge. Polygon PlayLet’s start with a triangle ABC. We can rotate clockwise so that each vertex moves clockwise by one step: We can also reflect (or flip)…

Counting with Categories (Part 3)

The n-Category Café — 7/2/2025

First lecture in a 4.5-hour minicourse on combinatorics with species.

A Professor Again

Computational Complexity — 7/2/2025

A new dean has taken my place, and I have returned to the professoriate at Illinois Tech, ending thirteen years in administration, six as dean and seven as department chair at Georgia Tech. I won’t rule out more administrative roles in the future,…

Double Maths First Thing: Issue 2B

The Aperiodical — 7/2/2025

Double Maths First Thing could really do with a hot lemon and honey Hello! My name is Colin and I am a mathematician on a mission to shift this blooming cold before the weekend, when I’m meant to be in Peterborough to rehearse for the PRE show in…

Position in Stellenbosch

The n-Category Café — 7/2/2025

Stellenbosch University wants to hire a mathematician. Apply before April 30th!

Category Theorists in AI

The n-Category Café — 7/1/2025

Who are the applied category theorists working on AI, and what are they doing?

Quantum Ellipsoids

The n-Category Café — 7/1/2025

Studying atomic nuclei forces us to quantize the concept of ellipsoid.

Categorical Linguistics in Quanta

The n-Category Café — 7/1/2025

Feature on Tai-Danae Bradley’s work on categorical linguistics.

The McGee Group

The n-Category Café — 7/1/2025

The McGee group is one of the two smallest groups with an outer automorphism that preserves conjugacy classes. My route to understanding this fact was a long and winding one.

What is a Good Quantum Encoding? Part 1

Math3ma — 7/1/2025

Over the past couple of years, I’ve been learning a little about the world of quantum machine learning (QML) and the sorts of things people are thinking about there. I recently gave an high-level talk on some of these ideas in connection to a…

Category Theory 2025

The n-Category Café — 7/1/2025

CT2025 conference announcement.

How Good are Permutation Represesentations?

The n-Category Café — 7/1/2025

Is the map from the Burnside ring to the representation ring of a finite group usually surjective, or usually not?

Potential Functions and the Magnitude of Functors 2

The n-Category Café — 7/1/2025

Potential functions from a functorial perspective.

Srivastava on Naive Set Theory

Blog - Logic Matters — 7/1/2025

In a previous book note, and also in the Appendix to the Guide, there is a review of Shashi Mohan Srivastava’s earlier A Course on Mathematical Logic. Parts of that book, as I say, could make useful supplementary/revision reading. So I was…

Two high school students have a new proof of the Pythagorean Theorem / Pythag theorem older than thought

Computational Complexity — 7/1/2025

(I wrote this post a while back so its no longer NEW. More important— if there has been a follow-up to the story that is not in my post, let me know.)   We have something NEW and something OLD about the Pythagorean Theorem. Now all we need is…

Counting with Categories (Part 1)

The n-Category Café — 6/30/2025

First lecture in a 4.5-hour minicourse on combinatorics with species.

(-e^{i\pi}) to Watch: Welch Labs

The Aperiodical — 6/30/2025

In this series of posts, we’ll be featuring mathematical video and streaming channels from all over the internet, by speaking to the creators of the channel and asking them about what they do. We spoke to Stephen Welch, of Welch Labs, which among…

The end of US democracy

Crooked Timber — 6/29/2025

I’ve held off posting this in the hope of coming up with some kind of positive response, but I haven’t got one. When I wrote back in November 2024 that Trump’s dictatorship was a fait accompi there was still plenty of room for people to disagree….

Bjorndahl’s Introduction to Classical and Modal Logics

Blog - Logic Matters — 6/29/2025

I have belatedly updated the PDF Appendix to the Study Guide and also the page of links to book notes — 76 of them! — to incorporate some blog posts from last year. And I am now starting to do more homework, as I slowly work up to revising the main…

Sunday photoblogging: Sète

Crooked Timber — 6/29/2025

The Protestant Work Ethic, Libertarianism, and the Welfare State

Crooked Timber — 6/27/2025

Many thanks to Hannah for her beautiful post on George Eliot’s Silas Marner and the evacuation of moral purpose from the Protestant work ethic. That resonates with Hijacked, my latest book, which traces the history of the work ethic from 17th…

The Distribution of Prime Numbers: A Geometrical Perspective

Computational Complexity — 6/26/2025

Alberto Fraile and Daniel Fernández guest post on random walks generated by the distribution of prime numbers.In our recent papers, we explored the sequence of prime numbers by defining “random walks” governed by simple algorithms applied to their…

ICT2, the paperback!

Blog - Logic Matters — 6/26/2025

So here it is, available from today. As with the other Big Red Logic Books, to keep the cost minimal, it is an Amazon-only print-on-demand book, ISBN-10 ‏: ‎ 1068346701. And, as with the other Big Red Logic Books, you can still download the latest…

Counting with Categories (Part 2)

The n-Category Café — 6/26/2025

Second lecture in a 4.5-hour minicourse on combinatorics with species.

When the moon hits your eye with a big piece of ( \pi )…

The Aperiodical — 6/26/2025

We do these things, not because they are difficult, but because they are ridiculous– Matt Parker, probably Matt Parker is going to the moon. I mean, not literally. Everyone’s favourite Stand-Up Mathematician is the sort of person who’s more likely…

The Herschel enneahedron on Numberphile

The Aperiodical — 6/25/2025

Me! On Numberphile! Who would’ve thought it? Earlier this year, Brady Haran visited Newcastle to record a video with some Leverhulme scholars. Luckily for me he had a bit of spare time to record a video with me, so we did one about the Herschel…

Double Maths First Thing: Issue 2A

The Aperiodical — 6/25/2025

Double Maths First Thing is the Ultimate Answer. Hello! My name is Colin and I am a mathematician on a mission to the moon! But I’m also on a mission to spread joy and delight in doing maths anywhere in the cosmos. Talking of doing maths in strange…

Tannaka Reconstruction and the Monoid of Matrices

The n-Category Café — 6/24/2025

Todd Trimble and I wrote a paper on characterizing classical groups (and monoids) in terms of their 2-rigs of representations.

Peaceful Terrorism?

Crooked Timber — 6/24/2025

The UK government has signalled its intention to “proscribe” the protest group Palestine Action under anti-terrorism legislation. This will place it in the same legal category as Al Qaeda and Islamic State: it will be illegal to belong to the…

PHQ’s Schubert on Sunday

Blog - Logic Matters — 6/23/2025

Back in 2012, the Pavel Haas Quartet recorded a prize-winning Schubert CD including a truly great performance of the Death and the Maiden Quartet. I wrote at the time: The Pavel Haas launch into the quartet with fierce attack and astringent (almost…

If you do well in the UMCP HS Math Competition you may win $1,000,000

Computational Complexity — 6/23/2025

The Univ of MD at College Park holds a HS Math Competition every year. At the reception for the winners Professor Larry Washington points to many past people who did well on the exam. Two stand out for different reasons:1) Serge Brin did well on…

The mathematical essence of origami blue-and-white porcelain

The Aperiodical — 6/23/2025

A story In my childhood memories, the lanterns in my hometown always fascinated me – circular palace lanterns, polyhedral colorful lanterns. How did my ancestors achieve the magical transformation from flat to three-dimensional through simple…

Potentialist conceptions of infinity, Peking University, June 2025

Joel David Hamkins — 6/23/2025

This will be a talk for the Conference on Infinity, a collaborative meeting of logicians and specialists in Chinese philosophy here at Peking University, 24 June 2025, in the philosophy department. Abstract. I shall lay out a spectrum of…

The symbol of earthly good, and the immediate object of toil.

Crooked Timber — 6/23/2025

Thursday afternoon I belatedly fulfilled a promise to post a book to Wilcannia. The school day was just finishing and as I left the Post Office I overheard a child around eight years old: Dad, I was so good today I got FIVE stickers. Dad was a…

TfE: On Post-Searlean Critiques of LLMs

DEONTOLOGISTICS — 6/22/2025

Here’s a recent thread on philosophy of AI from Twitter/X, in which I address rather popular arguments made by Emily Bender and others to the effect that LLM outputs are strictly speaking meaningless. I think these argument are flawed, as I explain…

Sunday photoblogging: heads

Crooked Timber — 6/22/2025

Helen de Cruz (1978-2025), RIP

Crooked Timber — 6/21/2025

Please consider donating to this fundraising effort (here) to support Helen de Cruz’s family. There is no greater joy for a teacher than to see a student develop and grow; and no more satisfaction to a mentor than to be overshadowed professionally…

A very short book note

Blog - Logic Matters — 6/20/2025

With a mind to building myself a reading list for homework before updating the BML Study Guide, I have been doing some online searches for recent publications on mathematical logic. I asked ChatGPT and Claude in “research” mode too, but they were…

Open letter to European Commission President Ursula von der Leyen on the skewed selection process for head of European Data Protection Supervisor

Crooked Timber — 6/20/2025

Hi CT readers, I’m publishing this open letter here so there’s a public record of the letter I’ve co-written and signed about what looks, walks and talks like a good old-fashioned Brussels stitch-up aimed at weakening the EU organisation that…

Are pro-natalists living on the same planet ?

Crooked Timber — 6/19/2025

Pro-natalism (the idea that people, or rather, women, should have more babies than they choose to do at present) has become an established orthodoxy,[1]. The central claim is that, unless something changes soon, human populations both global and…

And the other Big Red Logic Books?

Blog - Logic Matters — 6/19/2025

I had luxuriant locks, and the temple was still standing, when I originally started the notes on category theory. But here we are … (according to ChatGPT, channelling its inner Rembrandt). The history of earlier versions is embarrassingly untidy…

Lance never thought he would see a Pope who roots for the same team as him. And now…

Computational Complexity — 6/19/2025

A year ago if I showed you a picture of The Pope wearing a Baseball cap for the Chicago White Sox (or any Amercan team) you would assume it was computer-generated. And you would likely be right. Are there any real pictures of any Pope before Pope…

Fulbright Memories

Computational Complexity — 6/18/2025

As the entire Fulbright board resigned last week and as the program that promotes international visits for US researchers, and vice-versa, may not survive the Trump administration, I thought I would recount some memories from my Fulbright…

The game that LLMs are playing

Blog - Logic Matters — 6/18/2025

For a persuasive way of thinking about what LLMs are up to, read this particularly lucid and sane piece by the philosopher Keith Frankish. The post The game that LLMs are playing appeared first on Logic Matters.

Double Maths First Thing: Issue 29

The Aperiodical — 6/18/2025

Double Maths First Thing is excited about the moon! Hello! My name is Colin and I am a mathematician on a mission to spread joy and delight in doing and thinking about maths. Annoyingly, immediately after last week’s issue went out, several…

(-e^{i\pi}) to Watch: Boppana Math

The Aperiodical — 6/16/2025

In this series of posts, we’ll be featuring mathematical video and streaming channels from all over the internet, by speaking to the creators of the channel and asking them about what they do. We spoke to Ravi Boppana about his channel, Boppana…

Sunday photoblogging: Strasbourg cathedral

Crooked Timber — 6/15/2025

Introducing Category Theory again

Blog - Logic Matters — 6/14/2025

With a bit of useful proof-reading help from ChatGPT, and rather less from Claude, there’s a new version (2.8b) of ICT downloadable from the categories page. Between them, my friendly AI assistants found perhaps half a dozen straight-up typos per…

Particularly mathematical Birthday Honours 2025

The Aperiodical — 6/14/2025

The UK Government have announced the new set of King’s Birthday Honours. Here’s our selection of particularly mathematical entries for this year. If you spot any more, let us know in the comments and we’ll add to the list. Get the full list from…

Review of Patriarchy Inc by Cordelia Fine

Crooked Timber — 6/13/2025

“When diversity, equity and inclusion become ‘threats’ to the order of society,” Judith Butler wrote recently, “progressive politics in general is held responsible for every social ill.” Authoritarians are empowered to oppress vulnerable people in…

Carnival of Maths 240

The Aperiodical — 6/11/2025

The next issue of the Carnival of Mathematics, rounding up blog posts from the month of May 2025, is now online at Beauty of Mathematics. The Carnival rounds up maths blog posts from all over the internet, including some from our own Aperiodical….

Empathy as a Sin

Crooked Timber — 6/11/2025

You may have viewed Sen. Joni Ernst (R-Iowa) offering a mock apology for dismissing a constituent’s complaint that the Medicaid cuts she endorses will cause people to die with the flippant remark, “We are all going to die.” She tied her defense of…

Defending Theory

Computational Complexity — 6/11/2025

In the June CACM, Micah Beck writes an opinion piece Accept the Consequences where he is quite skeptical of the role of theory in real-world software development, concludingIt is important that we teach practical computer engineering as a field…

Lectures on Set Theory, Beijing, June 2025

Joel David Hamkins — 6/11/2025

This will be a lecture series at Peking University in Beijing in June 2025. Announcement at Peking University Course abstract. This will be a series of advanced lectures on set theory, treating diverse topics and particularly those illustrating how…

Platform work, redux

Crooked Timber — 6/10/2025

A few days ago, I experienced a strange auditive mix-up. My favorite German radio program, Deutschlandfunk, sent a documentary about “platform workers”. Uber, Deliveroo, etc., you might think, but no. This was about workers on oil platforms in…

The New Godel Prize Winner Tastes Great and is Less Filling

Computational Complexity — 6/9/2025

David ZuckermanThe 2025 Gödel Prize has been awarded to Eshan Chattopadhyay and David Zuckerman for their paperExplicit two-source extractors and resilient functionswhich was in STOC 2016 and in the Annals of Math in 2019. We (Bill and Lance) care…

Chibber’s Confronting Capitalism, Trump, and the Anxiety of Disordered Societies

Crooked Timber — 6/9/2025

A generation ago, General Electric’s CEO, Jack Welch (1935 – 2020) was the most admired business manager in the world. And General Electric purportedly the most admired corporation. Among his well-known attributes, Welch “would fire the bottom 10%…

Clara, Noa, Elisabeth

Blog - Logic Matters — 6/8/2025

As the world continues to go to hell in a handcart, let’s just pause for ten minutes to remind ourselves that there is beauty and tenderness … So from a couple of months ago, here are Noa Wildschut and Elisabeth Brauß playing the Three Romances for…

Happy World Ocean Day!

Crooked Timber — 6/8/2025

Except it’s not happy, of course. The ocean’s ecosystems are going to hell in a hand-cart, while our politicians congratulate themselves for signing up to pledges (like protecting 30% of the ocean by 2030) that they have no realistic plan for…

Introducing Category Theory (an almost final version)

Blog - Logic Matters — 6/5/2025

Not the paperback (yet). But there is now a full version of Introducing Category Theory that I don’t plan to do anything much more with than get my AI friends to continue proof-reading onwards from about half way through. I’ll cast my eye over the…

Rules vs Standards

Computational Complexity — 6/4/2025

You can write laws that are very specific, like the US tax code, or open to interpretation like the first amendment. In the literature these are known as rules and standards respectively. In computational complexity, we generally think of…

Inquiries-Week 2: Modular Fibonacci

Fractal Kitty — 6/3/2025

IntroductionIn this activity, we’ll explore patterns by finding the remainders when Fibonacci numbers are divided by other numbers.ModuloSometimes, the most interesting part of dividing numbers is what’s left over—the remainder. This is where…

Complexity theory of hand-calculations

Computational Complexity — 6/3/2025

(Thanks to David Marcus who sent me the video I point to in point 4 of this post. Tip for young bloggers (if there are any) you can have a half-baked idea for a post and then someone sends you something OR you later have an idea to make it a…

The Hilltop Story

Computational Complexity — 5/28/2025

On Route 1 in Saugus, Massachusetts, about a twenty minute drive from Cambridge, stood the Hilltop Steak House. When I went to graduate school in the late 80’s, Hilltop led all restaurants in the United States by sales (about $30 million in annual…

Monad

Abuse of Notation — 5/27/2025

title: A monad layout: microblog category: microblog tags: programming haskell — A monad is when you know how to convert $M (M a)$ to $M a$, but not $M a$ to $a$.

The level of progress in programming language design

Abuse of Notation — 5/27/2025

The level of progress in programming language design: Shortly after the first ever programming language was created, it’s author said that the language’s whole paradigm is flawed and we should do functional programming instead*. That was 46 years…

I want to forget

Abuse of Notation — 5/27/2025

I want to forget Gaza. I want to forget the pain. I want to forget all dumb jokes, old song lyrics. I want to forget that most things ever happened, as remembering makes everything tedious. Forces you to become a bureaucrat of your memories, to…

Love

Abuse of Notation — 5/27/2025

Every time you eat mushrooms, I have to try them too. Cause, if the mushrooms turn out to be poisonous and you die of slow and painful dead, I will die as well. I once dreamed that I was dying, You were beside me, I turned to you and said, “I don’t…

The road I walk

Abuse of Notation — 5/27/2025

The road I walk is new. It’s made not of stone, but dirt. There are no road signs yet. And no bridges to cover the rivers. The road I walk is new, so people think that it is hard. “How do swim?” “Don’t you get dirty?” “How do you cope with all that…

Walk

Abuse of Notation — 5/27/2025

Out for a walk I let go and let the city dissolve me.

Some are Mathematicians, some are Carpenters’ Wives, Some are Popes.

Computational Complexity — 5/26/2025

(Trivia: What song has the lyric Some are Mathematicians, some are Carpenters’s wives ? It’s not a parody song, though sometimes it’s hard to tell a parody song from a so-called real song.)In my post about Pope Leo XIV I made the following…

Using Automorphism Groups of Curves to Control the Slopes of their Jacobians

Good Fibrations — 5/23/2025

I’ve felt for a long time that automorphisms of curves should control or at least exert serious force on the slopes on their Jacobians. Symmetry forces height, as I’ve written about previously in Models of Formal Groups Laws of Every Height, and…

The Blog of Record

Computational Complexity — 5/21/2025

On Saturday, I had my last Illinois Tech graduation as dean before I step down at the end of June. The College of Computing had nearly 1600 graduates and I shook many, many hands that morning.After graduation I caught a plane to Washington, DC to…

Inquiries-Week 1: Circle Shading

Fractal Kitty — 5/20/2025

This is the first of a series of guided inquiries in math. If a document is preferred over a blog post, the pdf file is below:Inquiries-Week 1_ Circle ShadingInquiries-Week 1_ Circle Shading.pdf615…

Is Satire Dangerous in the AI-Age?

Computational Complexity — 5/20/2025

There have been times when satire has been mistaken for reality. A list of Onion stories that were mistaken for reality (or was it a mistake?) is here. When I say mistaken for reality I mean that a large set of people were fooled.My own…

Random Thought on the New Pope (the actual New Pope, not the TV series). He was a math major!

Computational Complexity — 5/20/2025

The New Pope is Pope Leo XIV (pre-Pope name is Robert Prevost). 1) Pope names are one of the few places we still use Roman Numerals. I saw an article that was probably satirical that Americans prefer Roman Numerals (the numbers Jesus used) over…

A Bittersweet Anniversary

Computational Complexity — 5/14/2025

The National Science Foundation was founded on May 10, 1950, 75 years ago last Saturday. No doubt the NSF has seen better days, but first let’s take a look back.At the end of World War II, Vannevar Bush, Director of the Office of Scientific…

Leibniz’s Dream and Dijkstra’s nightmare

Math ∩ Programming — 5/13/2025

I was inspired to browse some of Edsger Dijkstra’s essays today, and came across his speech, “Under the spell of Leibniz’s Dream”. It’s the sort of personal history I love to read, which gives one person’s sense of the world over a period of…

Skolem’s paradox and the countable transitive submodel theorem, Leeds Set Theory Seminar, May 2025

Joel David Hamkins — 5/12/2025

This will be an online talk for the Leeds Set Theory Seminar, 21 May 2025 1pm BST. Contact the organizers (Hope Duncan) for Teams access. Abstract: One can find in the philosophical research literature surrounding Skolem’s paradox a certain claim,…

My Graduate Career in Math

Math ∩ Programming — 5/12/2025

Editor’s note: This essay was originally published on Medium on 2016-03-05. I have made minor edits in this republishing and added a few small retrospective notes. 2010–2011 (Year 0) I had just switched my major at Cal Poly State University from…

Using AI for Reviews

Computational Complexity — 5/8/2025

I reviewed a paper recently and I had to agree not to use AI in any aspect of the reviewing process. So I didn’t but it felt strange, like I wouldn’t be able to use a calculator to check calculations in a paper. Large language models aren’t perfect…

My response to Scott’s least controversal post ever!

Computational Complexity — 5/6/2025

In a recent post by Scott (see here or just read my post which includes his post) he listed topis that he conjectured would NOT cause an outrage.I was going to write a long comment in his comments section, which would only be read by people who…

P v NP Papers Galore

Computational Complexity — 4/30/2025

As someone who has literally written a book on the topic, I have had many people over the years send me their attempts at P v NP proofs. On average, I receive about one a month, but I’ve had seven in the last two weeks. And not just the usual email…

A personal view of the NSF hot mess: My REU program

Computational Complexity — 4/28/2025

I wrote this about a month ago but wanted to wait until after the REU PI conference (which was April 21-22-23) to post it. I add a few comments based on what has happened since, which I preface with…

Real People

Computational Complexity — 4/23/2025

Right after the election I wrote a post predicting what would happen to higher education under Trump, most of which is coming true, but I had a massive failure of imagination missing the direct attacks on major universities. I won’t detail all the…

The Church of Logic podcast, April 2025

Joel David Hamkins — 4/21/2025

I was interviewed by Cody Roux for The Church of Logic podcast—a fascinating sweeping conversation on issues in the philosophy of mathematics and set theory, including what I described as a fundamental dichotomy between two perspectives on the…

China and I

Proses.ID — 4/18/2025

lately I’ve been watching a lot of videos on YouTube about China. it’s partly due to all the chaos around Trump’s tariff, but mostly these…

Eisenhower’s Farewell Address

Computational Complexity — 4/16/2025

I’m short on time time this week so I thought it would be good to look back, some 64 years ago, to Dwight Eisenhower’s farewell address. It calls for balance between the industrial-military Complex and the scientific-technological elite. While…

HEIR talk at FHE.org

Math ∩ Programming — 4/15/2025

Last month I gave a talk on the HEIR compiler project at the FHE.org conference in Sofia, Bulgaria. The video is on YouTube now, and the slides are public. I plan to write more about HEIR in the coming months, because it’s been an exciting and…

I want an application of this application of Ramsey Theory to Semigroups

Computational Complexity — 4/14/2025

I recently read the following theoremDef: A semigroup is a pair ((G,*)) where (G) is a set and * is a binary operation on (G) such that * is associative. NOTE: we do not require an identity element, we do not require inverses, we do not…

Why Can’t We Break Cryptography?

Computational Complexity — 4/9/2025

In the recent Signalgate scandal, several senior Trump administration appointees used the Signal app on their phones to discuss an attack on the Houthis. People discussed the risk of the phones being compromised or human factors, such as adding a…

I was invited to a Nutrition conference. Why?

Computational Complexity — 4/7/2025

From November of 2024 to March of 2025 I have gotten email inviting me to speak at conferences and/or submit to journals in the following topics:NOT EVEN CLOSE TO MY FIELD:Addiction Medicine, Behavioral Health and Psychiatry.Looking forward to…

A potentialist conception of ultrafinitism, Columbia University, April 2025

Joel David Hamkins — 4/6/2025

This will be a talk for the conference on Ultrafinitism: Physics, Mathematics, and Philosophy at Columbia University in New York, April 11-13, 2025. Abstract. I shall argue in various respects that ultrafinitism is fruitfully understood from a…

The hierarchy of consistency strengths for membership in a computably enumerable set, Oxford Logic Seminar, May 2025

Joel David Hamkins — 4/6/2025

This will be a talk for the Logic Seminar at the Mathematical Institute of the University of Oxford, 29 May 2025 5pm Andrew Wiles Building. Abstract. For a given computably enumerable set $W$, consider the spectrum of assertions of the … Continue…

238th Carnival of Mathematics

Fractal Kitty — 4/4/2025

Wow! It’s the 238th Carnival of Mathematics organized by Aperiodical. This has been a fun month with lots of submissions and lots of beautiful math art. To start let’s jump into the number 238 itself.238 is: 2 × 7 × 17.the sum of the

A small Haskell task

Abuse of Notation — 4/3/2025

Haskell is great. And I want more people to know it, so this is just a quick overview of it’s capabilities, using the code to solve a simple task I saw on Mastodon. The task is the following: Return a list of all combinations (i.e. order doesn’t…

Does Baby Have Hat

Math ∩ Programming — 4/1/2025

It’s April Cools! Last year I wrote about parenting, in 2023 about friendship bracelets. and in 2022 about cocktails. This year it’s a bit of a meandering stroll through some ideas around mutual aid and self-reliance. Maternity wards If you walk…

Time at the Recurse Center

Fractal Kitty — 3/25/2025

In January, I kicked off a journey of reflection and growth at the Recurse Center (RC) – a retreat where you work at the edge of your abilities with wonderful peers to pair program, study with, and grow. My goals in participating were to learn and…

Visual Insights (Part 2)

The n-Category Café — 3/20/2025

A talk about some striking mathematical images.

Visual Insights (Part 1)

The n-Category Café — 3/20/2025

I’m giving a talk next Friday, March 14th, at 9 am Pacific Daylight time here in California. You’re all invited! (Note that Daylight Savings Time starts March 9th, so do your calculations carefully if you do them before then.)…