Joel David Hamkins
@JDHamkins

Mathematics and philosophy of the infinite. Professor of Logic @NotreDame @UniofOxford #ProofandtheArt #PhilMaths #InfinitelyMore #BookOfInfinity

 University of Notre Dame
buymeacoffee.com/joeldavidha…
Joined November 2015
1,240 Photos and videos
I am very pleased to announce that The Book of Infinity is available for pre-order! All my favorite paradoxes and conundrums. #BookOfInfinity #InfinitelyMore
27
98
642
36,597
Today's talk at CUNY for the NYC Math Communication Seminar: Epistemic Logic Puzzles for Mathematicians! jdh.hamkins.org/epistemic-lo…

Epistemic Logic Puzzles for Mathematicians, NYC Math Education and Communication Seminar, October...

This will be a talk for the NYC Math Education and Communication Seminar, 20 October 2026, 12:15 – 1:15pm, at the CUNY Graduate Center in midtown Manhattan. Epistemic Logic Puzzles for Mathem…

jdh.hamkins.org
2
450
Joel David Hamkins retweeted
Avery Carr@ATCarrMath
23h
Interesting take from our celebrated logician @JDHamkins … if we altered the rules of chess where we forgo check and checkmate and actually have to capture the king, will the game be the same? Intuitively, we might say of course. Not so fast. Find out below 👇.
Joel David Hamkins
@JDHamkins
Oct 19
open.substack.com/pub/joelda…
1
1
3
390
open.substack.com/pub/joelda…
10
1,810
Back in the city. Giving 7 talks this week (!).
1
23
1,386
This is the view looking towards the 59th Street Bridge. You can as also see the skytram to Roosevelt Island.
2
516
open.substack.com/pub/joelda…

Every game of chess ends prematurely

Why do we play chess for checkmate instead of playing more naturally to capture the enemy king? Would it be game-theoretically equivalent? Surprisingly, no, the two ways of playing are not equivalent.

infinitelymore.xyz
1
19
2,016
Replying to @JDHamkins
Who wants to start a Standard Forepreantepenultimate Chess league with me? Our anthem is Take 5 by the Dave Brubeck Quartet.
1
1
4
634
Penultimate chess: mocking the standard chess checkmate rules. #InfinitelyMore open.substack.com/pub/joelda…

Every game of chess ends prematurely

Why do we play chess for checkmate instead of playing more naturally to capture the enemy king? Would it be game-theoretically equivalent? Surprisingly, no, the two ways of playing are not equivalent.

infinitelymore.xyz
1
2
14
1,446
Joel David Hamkins retweeted
Amazing Maps
@amazingmap
Oct 16
The largest page Adobe Acrobat allows in a PDF is about 381 km across.
11
10
162
19,362
A delightful article from mathematician Joel Hamkins! Written with clarity, depth, and a subtle whimsy. It inspired me to finally become a paid subscriber to his Substack. In a way, his writing reminds me of Damon Runyon (viewed at a certain level of abstraction) in that it juxtaposes formality with delight.
Joel David Hamkins
@JDHamkins
Oct 16
open.substack.com/pub/joelda…
1
2
5
623
open.substack.com/pub/joelda…

Every game of chess ends prematurely

Why do we play chess for checkmate instead of playing more naturally to capture the enemy king? Would it be game-theoretically equivalent? Surprisingly, no, the two ways of playing are not equivalent.

infinitelymore.xyz
7
8
77
15,501
infinitelymore.xyz/p/chess-g… #InfinitelyMore #FrivolitiesOfTheGods

Every game of chess ends prematurely

Why do we play chess for checkmate instead of playing more naturally to capture the enemy king? Would it be game-theoretically equivalent? Surprisingly, no, the two ways of playing are not equivalent.

infinitelymore.xyz
1
1
11
1,252
Now updated with a position that is winning for Black in standard chess, but losing in natural chess. Black has just played Qd2#.
2
314
Joel David Hamkins retweeted
Lake Michigan@LakeMichigan13
Oct 14
Spotlight on Chambers Island this morning. It has islands on a lake on an island on a lake 🌊🌊
5
28
394
3,618
I'm giving several talks next week in New York: - Tuesday: NYC Math Ed & Communication seminar - Friday: CUNY Logic Workshop - Friday: CUNY Graduate Student Logic Seminar In addition, I shall be recording four additional lectures in the ERGO studios for my Lectures on Infinity series. Links below.
2
3
35
1,551
more replies
jdh.hamkins.org/fundamental-…

On the fundamental theorem of finite games, CUNY Student Logic Seminar, October 2026

This will be a talk for the CUNY Student Logic Seminar on 23rd October 2026, 5pm at the CUNY Graduate Center in midtown Manhattan. On the fundamental theorem of finite games Abstract: We will give …

jdh.hamkins.org
1
297
ergo.org/courses/lectures-on…

Lectures on Infinity — Ergo

Joel David Hamkins guides viewers through the great paradoxes and discoveries about infinity, from Zeno's ancient puzzles to Cantor's revolutionary proof that some infinities are larger than others.

ergo.org
281
I am coming to the realization that the lively online community of game players in my Connect 4 app is very likely a community of bots. I found it a little strange to play Fred from France and Emilia from Japan, but then realized that the player names rarely fit the country. They must be mostly fake.
6
52
3,601
Load more