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1st June 2018 In Cambridge, in June, someone is taking a photograph of someone taking a photograph of someone taking a photograph.

Rota I like this framing; I often tell grad students that it's important to try to cultivate attitudes towards one's work that make it fun, but I think there's a bit more to it. The positive signals one gets from doing math are kind of rare ("I proved something!") and a bit dangerous.

What happens if you add the power set operation to bounded ZFC set theory? I provide an answer on MathOverflow. mathoverflow.net/a/495760/1946

On Duolinguo, in the conversation Kai-san said that in Hokkaido he went hiking every day (mainichi Hokkaido de haikingu o shimasu), and the question was whether he went hiking every week, and I said yes, since if you hike every day, then it follows that you also hike every week.

An extended excerpt from Lectures on the Philosophy of Mathematics, regarding abstraction in the function concept. infinitelymore.xyz/p/abstraction-… #InfinitelyMore #PhilMaths

Mathematicians don't want you to know this secret, but you can just multiply both sides of an equation by 0 and you'll get a true statement.

My upcoming lecture series at Peking University jdh.hamkins.org/lectures-on-se…

Realized today, while walking through Times Square in a downbeat contrapositive mood, that if there is anywhere where you can't make it, then you can't make it in New York.

Mike Dupont That goes for me also, but doubly negative.

Jackson Hole on the Upper East Side. Great scene down the steps, awesome meal.

Infinite Connect Four, Infinite Connect Five, Infinite Connect Twenty, indeed, Connect Infinity! Can you find the winning strategy? Learn the surprising result. infinitelymore.xyz/p/infinite-con… #InfinitelyMore #FrivolitiesOfTheGods

Philosophy Department, Peking University.

Typical girls one finds enjoying the summer day here in Beijing...