I'm a mathematical physicist who likes explaining stuff. Sometimes I work at the Topos Institute. Check out my blog! I'm also a member of the n-Category Café, a group blog on math with an emphasis on category theory. I also have a YouTube channel, full of talks about math, physics and the future.
Public Key
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Profile Code
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Author Public Key
npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m Show more details
Published at
2023-09-24T00:14:08+02:00 Event JSON
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Last Notes npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez Have you ever tried learning physics from a teacher who does calculations without explaining them well? Setting constants equal to 1, then putting them back later using dimensional analysis. Setting terms equal to zero when they're negligible - which you're supposed to know by instinct. And so on. You're just supposed to watch it and pick it up. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1e6h…ckhy - Americans have evolved to require ketchup. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez If you don't anything about Æon Flux, here's a show about it - the animations that Peter Chung made, not the later movie with Charlize Theron. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub10m3…j2yt - it took me some work to figure this out. Very fun, though! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub10fr…aw9l - my friend is also using a 3d printer to make monotiles... npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub189n…satx - they've switched to supporting Harris. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub160h…xddr - groovy! 🎃 npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1jd5…grlk - that's a very good point: the firm may be deliberately *not* making tiles whose edges are exactly integer multiples of a unit. That would be clever. They don't say anything about this. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1jsy…tp7j - Thanks. I'm glad to hear it's sort of addictive, at least for some people! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1ky2…ghvc - that sounds good! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1r4c…u09p - is that related to what Michael Keithson is talking about at 15:23 here? npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1cv8…n0fl - cool! Let me know how it goes! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1lau…uqs9 - maybe I will wait 5 or so years. But someday I want to write expository math papers with moving images! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1trh…wqd9 - great! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub16d3…5hz8 - thanks! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez https://www.youtube.com/watch?v=r-SUdkc5XI4 npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1drg…7yxw - Kamala Harris has raised $81 million in new funds since Biden stepped down on Sunday. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1tve…ejsx - great! For a lot more on information theory I highly recommend Cover and Thomas' book - it's in the list of recommendations on page 113. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1zly…j8gf - those sailors and their quaint superstitions, which people who never sail don't understand. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1c5p…e3g4 - it's great when you can go out of a city and quickly reach some nice countryside. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1cmx…pdlf - by the way, my book will be free in PDF form and I'll announce it here. I promise to explain all this stuff carefully. Indeed, my post here is like a tiny little abbreviated excerpt. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub12vv…u68m - this is what you get for going into math. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1t76…4l63 - shit, I forget what happened since then. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1cyk…g8fq - sorry for blowing out some steam at you. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1ky2…ghvc - yes, that's good. Did you see this?[email protected] /112772973324157439 npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub17wk…8ey0 - nature keeps giving us hope. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1mzd…qxcp - thanks! We're here now and we already do! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1npx…e8ra - I can try it if you give up. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1jjc…httr - cool! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1uhn…2f8t - thanks! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1ptg…d7cp - We already own a flat here and we're loving it! The reason is exactly what you say: it's human, we can walk to pubs and shops, and many of them are run by actual people instead of big corporations. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1jqd…vn8e - thanks! Yes, the ideal job is one you already do every morning lying in bed drinking coffee. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1n9u…rzgl - thanks! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub10k6…ew8f - I've been here 2 years, from summer to January. Then I flee, crying "Nevermore!" But I keep wanting to come back. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub179d…8nud - Thanks! I had retired, but it turns out I wasn't done. Scotland is a neat place. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1kc7…tf4u - Thanks! I'd rather go down the drain soon, before it gets clogged. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub18a6…v60j - thanks! I'm looking forward to it. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub19uc…xyj8 - I tend to get a bit overwhelmed by the big festival in August, but I see this one is in July. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez I really like the energy, rhythmic complexity and conciseness of Rush's song Tom Sawyer - and if you do too, you may enjoy watching a bunch of first-time reactions to it. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1txd…txmn - I shopped, but now I'm back and I wrote part 2: npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub15m3…9amh - great! 80% is pretty good, that's a lot more than the amount of hydrogen that got converted to helium in the Big Bang. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1z2q…3yuf - Yikes! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1cyk…g8fq - yeah. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez I get annoyed when people call liberals "snowflakes", but maybe it's true: Democrats are hand-wringing about how Biden did in the debate, while Republicans act utterly unconcerned that their candidate is an old, half-senile sexual abuser, convicted felon and wannabe dictator. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1fdk…waw4 - I'll have to get back to you on this, I'm pretty slow when it comes to parsing symbol strings! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1yny…egrt - as you can see from the case with just one object, it's going to be complicated. But the general case can probably be worked out from that one basic case. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1g7v…scf3 - I think they meant to say "In intuitionistic logic, and more generally, constructive mathematics, statements are assigned the value "true" only if they can be given a constructive proof." npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub16hx…u6hc - great, thanks! I was a bit worried about it, but now that Twitter feels like a thing from a bygone golden age I like it better. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1cyk…g8fq - better than being high *on* entropy. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1gy0…20j5 - no, they are responsible for their own entropy. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1sm7…jkcu - yes, that's a weirdly different case. And in dimension 1, Newtonian gravity gives a constant attractive force, coming from a |r| potential! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1tpv…zwsk - thermodynamics says they can transfer energy to you. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1vuh…nl4f - great! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez Bennett did a *second* video concentrating on the cluster chords. More fun! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez David Bennett does a more detailed analysis of the rhythm. At first the 7/4 meter is broken into 3 groups of three 1/8 notes, then a fourth group of three 1/8 notes followed by a quarter note, for a total of npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1ma3…q8k6 - I guess my complete innocence of routing protocols is my main problem here. No need to explain them; it would take a lot of work. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1nr6…6wqx - I wasn't talking about energy. I was talking about electric charge. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub187u…dmq3 - if we were made of antimatter using wires that carried positrons, the convention we use for current would make great sense. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1697…z9te - in the US it's MAGA, but it's all over the world: Farage, Orban, Modi, Le Pen, Meloni, etc. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub16hx…u6hc - instead of electrons they should be called criticules: a word that should be used more. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub13v8…vf74 - you just enjoy arguing. We have to pick a convention and the obviously better convention is to take the dominant charge carrier in the universe, and the main player in chemistry, to be positive. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1t76…4l63 - but you can't blame him: it was only much later that we realized npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1czz…5kz5 - where does he say we shouldn't worry about it? npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1skj…mjh7 - I'm going to patent the raspberry optimizer. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez The latest Fox News poll is out. Guess who claims the results are "trash" - and also disputes the poll results claiming more voters rank “the future of American democracy” as "extremely important” than any of the 10 other issues? npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub13g2…m4y3 - okay, I was hoping for something like that... but I always forget this "tiny" business. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1yxx…p7am - can you do it with more than one 12-pointed star? Infinitely many? npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1uhn…2f8t - I find it's hard persuading people that the strong force doesn't follow any distance-dependent force law... breaking them from the whole idea. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1zp4…z54k - yes, that's where I got most of my info. I should have linked to it! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1tkl…pt2p - Great! One of my favorite novels. I didn't like it quite as much the third time I read it: I think I started seeing the mechanisms of the magic tricks Crowley plays. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1vny…n9q4 - what a bunch of bull. (Papal bull.) npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1gjl…lr8w - okay, so it's not just my weird brain acting up! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1cyk…g8fq 😜 npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1ssd…gd7s - Cool! I didn't know people charged their buggies! The ones I see on the bus are just ordinary non-electric baby carriages. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1cyk…g8fq - oh, that's a very interesting interpretation. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez Whenever I see this on the bus it makes me think they're offering some sort of defective wifi access. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub12n4…8z9u - if protons are men and electrons are women, this is 3 men held together by 2 women. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1t76…4l63 - I was hoping to see funny answers to that question, but just saw lots of statistics. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub19g8…9445 - okay, the best I can do right now is the section on insolation starting on page 40 of this book: npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub19g8…9445 - I used to have the formula you want, but I seem to have lost it! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1q9g…6uv9 - was I audible? It was really hard for me to hear people on your side! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub19g8…9445 - does this help or not? npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub184j…7dha - Musk manages to pick the wrong side on every issue. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1zp4…z54k - you know a lot of practical stuff about lasers! I know a lot of fun but useless stuff. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1zp4…z54k - thanks, I'll try it at the gym! (That's when I watch videos, I get twitchy watching videos otherwise, I prefer text because it's faster.) npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub16hx…u6hc - has anyone been mistakenly milkshaken? npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1738…klnq - thanks! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub14f6…afz5 - hmm, I don't what that's really like. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1c9m…9xjd - looks like you got Jewish carpenter elves. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub13dl…qfg2 - That's weird. I'm glad Mathstodon has been helpful to you! I plan on sticking around. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1hve…fxk8 - I'm dreaming of a "xenon bomb". npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1cha…d2hp - I've read some, and I should read them all! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub15m2…ahal - looking at what's most popular, I don't find most of it very interesting. So maybe you're not missing much. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub15m2…ahal - okay, it was on mastodon.social, here: npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub15m2…ahal - strangely, now I can't find it (so I deleted my comment). But I was using it yesterday! npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub15m2…ahal - there is now on Mathstodon a way to see most liked (ok, starred) posts. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1cyk…g8fq - yes, he's really lost in strange fantasies. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1a7m…j0p9 - I can see reasons why "open science" people would be more committed to the fediverse than mathematicians and physicists. npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1790…frxx 😵💫 npub17u6xav5rjq4d48fpcyy6j05rz2xelp7clnl8ptvpnval9tvmectqp8pd6m John Carlos Baez @npub1zsg…kvsw 😵💫
