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Recently I discovered a surprising fact about numbers, so I made an online web thing to give it the recognition it deserves. Give it a go:
A little write-up on @aperiodical at

In the 90s, MIT's Athena system devised a system to handle online harrassment. One feature of the system was that the notice of reported abusive behaviour sent to the accused user began with the phrase "Someone using your account…". Users were advised to re-password their accounts, as they may have been hacked. Password resets by UYA recipients were taken in good faith by staff, but the most astonishing thing was that the offending behaviour nearly always stopped there.

I need to remember this technique in the event of anyone doing stuff that merits a warning.

It gives me some solace that the megabrains on the math-fun mailing list are having a very handwavey discussion about what it means for the continuum hypothesis to be 'true' or 'false'.

33. PUZZLE IN REVERSALS. Most people know that if you take any sum of money in pounds, shillings,
and pence, in which the number of pounds (less than £12) exceeds that of the pence, reverse it (calling the pounds pence and the pence pounds),
find the difference, then reverse and add this difference, the result is always £12, 18s. 11d. But if we omit the condition, "less than £12," and allow nought to represent shillings or pence--(1) What is the lowest (1/2)

what do you call two cephalopods that can be deformed continuously into each other Show more

I really love capturing the state of a highly viscous fluid at a snapshot in time, AKA baking a marble cake 🎂 😛

@jennytrustad @jhertzli @christianp To round it out: what's green and homeomorphic to the open unit interval?

Happy 13²-th birthday, Felix Klein!
Happy 5²/2², everybody else!
Happy 6th birthday, @aperiodical!

@esoterica Lionel Richie's underrated follow-up to "Once, twice, three times a lady"

@christianp @jhertzli My favourite mathematical humour is:

What do you get when you cross a mosquito with a mountaineer?

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A Mastodon instance for maths people. The kind of people who make \(\pi z^2 \times a\) jokes.

Use \( and \) for inline LaTeX, and \[ and \] for display mode.