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Andrés E. Caicedo @andrescaicedo01.bsky.social · 11h

Is the royal 'we' another example, or is this a different phenomenon?

Reposted by Andrés E. Caicedo

Finn Longman is only here occasionally @finnlongman.com · 06/11/2025

He keeps doing it. Every time somebody gets beheaded in this text, the word "head" is replaced with a little hand-drawn emoticon. And considering how many people get beheaded in this story, that's a lot of lil face drawings.

A manuscript in which two instances of the word "head" have been replaced by small faces

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 07/10/2026

Awesome. Speaking of which, do you have plans to publish "The Fallen Master" beyond the limited edition of "The Tainted Cup"?

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Eugene Vinitsky 🍒 @eugenevinitsky.bsky.social · 06/10/2026

Reach out to your math friends and offer to get coffee. For real

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Tim Clare @timclare.bsky.social · 05/09/2026

The Knight's Tour is the route a chess knight would have to take to visit each square of the board exactly once. A knight moves 2 squares on 1 axis & 1 in the other. It has inspired experimental literary forms, like Sanskrit poems that can be read left to right or by jumping syllables like a knight.

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Leo Cadogan @leocadogan.com · 01/09/2026

Typos (not many considering how fast we’re working). Zaragoza, 1663.

Paragraph of errata headed “Erratas. No son muchas, para lo que và tan de prisa”.

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Sarah M @lore.house · 28/08/2026

This just in: New Mnemonic for Americans trying to remember the Great Lakes is SHAME

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 21/08/2026

Thank you! I'm enjoying these threads very much.

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 21/08/2026

I have a very naive question: how do you identify the films to watch? I imagine there may be indie films with limited release not listed in, say, IMDB.

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 17/08/2026

Like a Platinum credit card, you mean?

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 07/08/2026

(Anyway, glad you noticed the end result before sending the email.)

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 07/08/2026

There was a series of papers on sphere-like manifolds, which at the end turned out to just be spheres. I suspect the legend came from this.

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Skot Armstrong @skot.bsky.social · 24/07/2026

Los Angeles Public Library unveils the world’s largest pop-up book www.thisiscolossal.com/2026/07/dani...

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🐺Cold🪦Sam🪾 @pdfmerchant.bsky.social · 18/07/2026

lmao just found a this hilarious line from Peirce where he writes, "if you, dear Reader, are inclined to suppose I have overlooked something comparatively obvious, please consider the possibility I have not"

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 20/07/2026

I find it wrong to call a question of that kind a conjecture, but I've found many mathematicians are less picky about such terminology.

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 20/07/2026

Did people actually believe it? My understanding of the situation was that this was a natural question annoyingly resisting attack, and asking it in the form of a conjecture was a good way to stimulate work on it, particularly if one conjectures the 'interesting' option.

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robertfathauer.bsky.social @robertfathauer.bsky.social · 05/07/2026

Over 5,500 mathematical artworks can now be browsed in an attractive new gallery-wall layout on the Bridges website, thanks to the efforts of Nathan Selikoff: gallery.bridgesmathart.org/gallery?seed...

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 15/06/2026

The sets in their construction are of very low Borel complexity, but I don't recall whether any were actually closed. At the cost of increasing by one the number of needed sets you can always have one of them be a Cantor-like perfect set.

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 03/06/2026

Congratulations on the book, by the way!

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 03/06/2026

Hi. Do you know if there will be a chance to join soon at a tier other than the $100/month? I am interested in the chapbooks, but right now that is the only available option.

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 01/06/2026

Ah, thanks; that's what the ascending notation means.

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 01/06/2026

Sorry, I don't understand what your notation means. It seems to describe an a equal to its omega^omega-th power. Or an a which is an omega^omega power. Don't see epsilon_0 there in any case.

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 01/06/2026

In the theory of determinacy, similarly, we only have a limited amount of choice, so rather than discussing arbitrary sets of reals, one tends to concentrate on the infinity-Borel ones (those that have a 'generalized' code).

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 01/06/2026

Yes, without any choice, the right notion is the codable version. This also allows us to develop Lebesgue measure ina reasonable way (i.e., without every set being null, for instance). The reference I've seen on this is Vol. 5 of Fremlin's treatise on measure theory.

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 01/06/2026

You cannot! It is consistent with ZF that the set of reals (and therefore any of its subsets) is a countable union of countable sets (and therefore Borel).

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Dr Surekha Davies, Historical Monster Consultant (she/her) @drsurekhadavies.bsky.social · 30/05/2026

Historian and former British Library curator here. Of all the mutton-brained decisions taken by universities in relation to libraries, @mit.edu offers an example of the worst: CLOSING LIBRARIES. 1/ 💙📚 🧪🗃 #academicsky fnl.mit.edu/may-june-202...

fnl.mit.edu

Lament for the MIT Libraries - MIT Faculty Newsletter

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Sophia_Nyx 🐰 @sophianyx.bsky.social · 28/05/2026

Name your fav Steven King novel.

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 01/05/2026

Hello. Does anybody have access to the *cover* of the New York Times Book Review for April 15, 2001 ("Vandals in the stacks!")? Could you please post or send me a picture or pdf of it? The best I can find is the microscopic image here: archive.nytimes.com/www.nytimes.... Thanks!

archive.nytimes.com

The New York Times Book Review

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 30/04/2026

(Ah, I just saw you posted a video. Thanks!)

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Andrés E. Caicedo @andrescaicedo01.bsky.social · 30/04/2026

Is there a way of getting a transcript or a draft of the speech?

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Lauren Gawne @superlinguo.bsky.social · 30/04/2026

I'm sure I wasn't the only kid with weird reading habits who found Desmond Morris's work in secondhand bookstores. As an adult, his collaborative 1979 book on Gesture in Western & Southern Europe has been something I've returned to frequently in my research. www.bbc.com/news/article...

bbc.com

Zoologist and author Desmond Morris dies aged 98

Morris, who was also a surrealist painter and broadcaster, was best known for his 1967 book The Naked Ape.

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c0nc0rdance @c0nc0rdance.bsky.social · 17/04/2026

Hot off the presses! Some people think I'm a stereotype of a nerd 🤓, but isn't that kind of a cliché? Let's talk about how "stereotype" & "cliché" were invented by the printing press. Movable type depended on typesetters putting little letter blocks (a 'sort' or 'type') in 'forms'.

A form, a bracketed rectangle with movable type carefully laid out in rows of varying sizes.

Stolen from a Medium article:
"The original movable type. Image source: Flickr, purdman1"

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