dannycalegari.bsky.social @dannycalegari.bsky.social · 13/08/2026Summer of soup continues! Today it's heirloom tomato soup. I can't get over the gorgeous colors!! 020
dannycalegari.bsky.social @dannycalegari.bsky.social · 12/08/2026Amazing new result from Claude: at least 2/3 of the nontrivial zeros of the zeta function are on the critical line Re(z)=1/2!!! Montgomery's conditional results replaced with linear algebra following ideas of Baluyot, Goldston, Suriajaya and Turnage-Butterbaugh www-cdn.anthropic.com/564f962e6064...www-cdn.anthropic.com 021
dannycalegari.bsky.social @dannycalegari.bsky.social · 11/08/2026Is this what they mean by cuts to STEM education? 051
dannycalegari.bsky.social @dannycalegari.bsky.social · 10/08/2026Heirloom tomatoes, bread, and artichoke-olive tapenade from Hyde Park farmer's market on 61th! Almost makes it worth getting up early on Saturday mornings! 020
dannycalegari.bsky.social @dannycalegari.bsky.social · 02/08/2026Amazing De Kooning exhibit at the Art Institute covering his entire career, and revealing some sides that were hitherto completely unknown to me. Also a fabulous Hannah Wilke that I saw on the same trip. 000
dannycalegari.bsky.social @dannycalegari.bsky.social · 28/07/2026Oh good, that will restore objectivity and balance. www.nytimes.com/2026/07/28/b...nytimes.comRoss Douthat Joins ‘60 Minutes’ as a CorrespondentMr. Douthat, an opinion columnist at The New York Times, will join the CBS News program, along with several other journalists. 010
dannycalegari.bsky.social @dannycalegari.bsky.social · 27/07/2026I don't use this word lightly, but if this is really happening (independent confirmation from reliable news sources would be good??) then I am stunned by the level of evil and contempt it displays. So much for Anthropic being the "good guys". xcancel.com/HedgieMarket...xcancel.comHedgie (@HedgieMarkets)🦔AI companies are bulk-buying rare books, scanning them through high-speed machines that cut the spines off, and shredding the originals. A service called ISBNdb facilitates orders of up to a million ... 032
dannycalegari.bsky.social @dannycalegari.bsky.social · 23/07/2026Fields medals awarded at the ICM! No surprises, and all the recipients more than worthy. Congratulations to all! (and especially to my colleague Yu Deng!) www.simonsfoundation.org/2026/07/23/2...simonsfoundation.org2026 Fields Medals Awarded to Four of World’s Top Mathematicians2026 Fields Medals Awarded to Four of World’s Top Mathematicians on Simons Foundation 011
dannycalegari.bsky.social @dannycalegari.bsky.social · 21/07/2026The Jacobian Conjecture is false!! Elementary-(ish) counterexample due to Claude Fable! This was one of the best-known open problems in algebraic geometry; certainly I heard about it as a grad student. Hooray! (?) xenaproject.wordpress.com/2026/07/20/h...xenaproject.wordpress.comHuman mathematicians are being outcounterexampledIt’s been an interesting few weeks for counterexamples. This post is basically my perspective of what has been going on in the world of formalization, AI tools and, in particular, counterexam… 001
dannycalegari.bsky.social @dannycalegari.bsky.social · 17/07/2026Absolutely spectacular art at the Frist Museum in Nashville by Anila Quayyum Agha. An Alhambra for the 21st century. I was literally speechless. 020
dannycalegari.bsky.social @dannycalegari.bsky.social · 14/06/2026Crazy weather - storm damage from a couple days ago in Hyde Park. :( 030
dannycalegari.bsky.social @dannycalegari.bsky.social · 11/06/2026I don't generally think anyone's death is cause for celebration, but I won't shed any tears for the passing of cartoon villain Lee Raymond www.nytimes.com/2026/06/10/b... For a different approach, maybe read George Saunders' latest novel www.bbc.com/culture/arti...nytimes.comLee Raymond, Who Created Exxon Mobil, Dies at 87 020
dannycalegari.bsky.social @dannycalegari.bsky.social · 09/06/2026Summer of soup continues - this time it's a slow-cooked vegetarian French onion soup! Zut alors, c'est magnifique!! 010
dannycalegari.bsky.social @dannycalegari.bsky.social · 07/06/2026Some great current exhibitions at HPAC, including "Cooler by the Lake" by Ann Toebbe www.hydeparkart.org/exhibition-a... 000
dannycalegari.bsky.social @dannycalegari.bsky.social · 07/06/2026Another figure from the upcoming paper with Alden. Let f:z -> sz-1 and g:z -> sz+1 for s a suitable root of z^3+z^2-z+1. Let alpha be the black arc in the figure. Define T:= U w.alpha = T as w ranges over finite words in {f,g}. Then T is a topological R-tree dense in a Jordan domain and T = fT U gT. 010
dannycalegari.bsky.social @dannycalegari.bsky.social · 26/05/2026Sunday was my birthday: 54 years old, a new personal best! Went to the Smart Museum (and saw a fabulous Gladys Nilsson), a walk through Washington park, dinner in the west loop, and another nice walk through downtown afterwards. Good age to turn - would recommend! 020
dannycalegari.bsky.social @dannycalegari.bsky.social · 18/05/2026In Ithaca a couple of weeks ago for the Cornell Topology Festival! Highlights include hiking the gorge, Moosewood restaurant, and hanging out with John Hubbard. e.math.cornell.edu/sites/topolo... 030
dannycalegari.bsky.social @dannycalegari.bsky.social · 17/05/2026Figures from forthcoming paper with Alden Walker. The picture on the left describes a 2-dimensional family of piecewise linear (discontinuous) maps on the circle. If you take the top of the picture and wrap in around the circle you recover Thurston's laminar model of the abstract Mandelbrot set! 040
dannycalegari.bsky.social @dannycalegari.bsky.social · 17/05/2026Hyde park farmers market has reopened for the summer! Time for some home made carrot soup! 050
dannycalegari.bsky.social @dannycalegari.bsky.social · 11/05/2026Happy Mother's Day to all! www.youtube.com/watch?v=wEty... 010
dannycalegari.bsky.social @dannycalegari.bsky.social · 11/04/2026More cherry blossoms in Hyde Park! Last week was mostly pink, this week they're white. Also featured: the (almost complete) Obama center. 071
dannycalegari.bsky.social @dannycalegari.bsky.social · 06/04/2026Cherry blossoms in Hyde Park! Probably the peak will be next weekend. 060
Reposted by @dannycalegari.bsky.socialMerp @imagin8ion.bsky.social · 24/03/2026Idk who owns it, but been very happy w/thriftbooks. I guess it could be benefiting someone awful on the back end but afaik, I’m just participating in used book/secondhand economy like on eBay: keeping stuff out of landfills & money in small hands. They *always* have a copy of whatever obscure thing. 4174
dannycalegari.bsky.social @dannycalegari.bsky.social · 24/03/2026Origami curve on the sphere - it's possible to fold the sphere over itself in such a way that this curve folds up over itself at the same time! 161
dannycalegari.bsky.social @dannycalegari.bsky.social · 20/03/2026The greatest player in snooker history just got a little bit greater: www.bbc.com/sport/snooke...bbc.comWorld Open: Ronnie O'Sullivan makes highest-ever professional break with historic 153Ronnie O'Sullivan creates more snooker history by making the sport's highest-ever professional break with a 153 at the World Open in Yushan. 010
dannycalegari.bsky.social @dannycalegari.bsky.social · 16/03/2026This is one of the more evil proposals I have ever read. Where is the outrage on this? Where are my senators? Dick Durbin? Hello?? www.nytimes.com/2026/03/16/h...nytimes.comU.S. Considers Withholding H.I.V. Aid Unless Zambia Expands Minerals Access 041
dannycalegari.bsky.social @dannycalegari.bsky.social · 16/03/2026Voted early in Chicago for Juliana Stratton (Senate) and Robert Peters (IL-02). Appalled to see all the crypto dark money propping up their opponents in the Democratic primary. 0173
dannycalegari.bsky.social @dannycalegari.bsky.social · 28/02/2026"But late Friday .. OpenAI said it had reached its own agreement with the Pentagon to provide its A.I. for classified systems. OpenAI said it had found a way to put safeguards into its technologies that would somehow prevent the systems from being used in ways that it does not want them to be." 2/2 0100
dannycalegari.bsky.social @dannycalegari.bsky.social · 28/02/2026"Sam Altman, the chief executive of OpenAI, said in a memo to employees this week that “we have long believed that A.I. should not be used for mass surveillance or autonomous lethal weapons,” which is the same stance as Anthropic’s." 1/2 0100
dannycalegari.bsky.social @dannycalegari.bsky.social · 27/02/2026You know if you fold a piece of paper and make a cut and unfold it you get a cool shape? What if you do the same fold 10 times before you make the cut? 090
dannycalegari.bsky.social @dannycalegari.bsky.social · 16/02/2026Deleted my Facebook and Instagram accounts, canceled my Amazon prime account, boycotted Amazon and Whole Foods since the inauguration. Was never on X and never will be. Never subscribed to any paid AI service. But I can and should do more, and so should you. www.resistandunsubscribe.comresistandunsubscribe.comResist and Unsubscribe 051
dannycalegari.bsky.social @dannycalegari.bsky.social · 10/02/2026Article about the speed with which China is rushing past the US in every aspect of their economy, including (especially) tech. Tracks with my own experiences in Beijing in 2025 seeing the unbelievable depth of talent in the math department at Peking University. www.nytimes.com/2026/02/10/o...nytimes.comOpinion | I Just Returned From China. We Are Not Winning. 070
dannycalegari.bsky.social @dannycalegari.bsky.social · 06/02/2026Remarkably sane analysis from a conservative economist. www.nytimes.com/2026/02/06/o...nytimes.comOpinion | The Finance Industry Is a Grift. Let’s Start Treating It That Way. 160
dannycalegari.bsky.social @dannycalegari.bsky.social · 15/01/2026Ironically, this pro-crypto website is a great resource to identify politicians who want to properly regulate crypto so that you can give them your support. www.standwithcrypto.org/politicians (2/2)standwithcrypto.orgFind out where politicians stand on cryptoCrypto drives American innovation. Keeping crypto in America means securing 4 million jobs over the next 7 years to increase economic mobility. Discover the politicians fighting to keep crypto in Amer... 082
dannycalegari.bsky.social @dannycalegari.bsky.social · 15/01/2026www.nytimes.com/2026/01/15/t... Crypto - the currency of choice for criminals and nitwits. The good news is that Republicans and Democrats are united in their regulatory response to this lawless behemoth. The bad news is that they both embrace it. (1/2)nytimes.comThe Biggest U.S. Crypto Company Asserts Its Power in Washington 060
dannycalegari.bsky.social @dannycalegari.bsky.social · 13/01/2026Credit: David Smead; excerpted from www.jstor.org/stable/25678... 050
dannycalegari.bsky.social @dannycalegari.bsky.social · 12/01/2026Interesting new blog post by Jordan Ellenberg using ML to find large coefficients of Kazhdan-Lusztig polynomials (and along the way creating a fun new variant of Sudoku): quomodocumque.wordpress.com/2026/01/12/b...quomodocumque.wordpress.comBruhat intervals that are large hypercubesNew paper up on the arXiv! With Nicolas Libedinsky, David Plaza, José Simental, Geordie Williamson, and (unofficially) Adam Zsolt Wagner. A bunch of algebraic combinatorists! And this is a combinat… 040
dannycalegari.bsky.social @dannycalegari.bsky.social · 04/01/2026Article on Venezuela by someone who has actually spent some time there, and seems to care about the lives of the people who live there: www.nytimes.com/2026/01/04/o...nytimes.comOpinion | What I Learned in Venezuela 031
dannycalegari.bsky.social @dannycalegari.bsky.social · 02/01/2026So I have been boycotting everything Bezos since January; thus when I bought some technical math books recently I got them from AbeBooks ... which turns out to be a subsidiary of Amazon :/ What are better online options (when bricks and mortar -which is my first option - fails)? 141
dannycalegari.bsky.social @dannycalegari.bsky.social · 24/12/2025Mince tarts made from scratch! (first time ever) The oven smoked a bit, and the fire alarm did go off, but that's the price of haute cuisine ... 160
dannycalegari.bsky.social @dannycalegari.bsky.social · 06/12/2025As a grumpy old man who grew up on Pascal and C++, I am finally getting around to learning Python, and I am flabbergasted at how awesome it is. Here's a random spanning tree of a map of Australia! 050
dannycalegari.bsky.social @dannycalegari.bsky.social · 20/10/2025Excellent concert yesterday by Ukrainian folk group Kurbasy! 0100
dannycalegari.bsky.social @dannycalegari.bsky.social · 18/10/2025Chicago No Kings Protest!! Biggest crowds I've ever seen. 280
dannycalegari.bsky.social @dannycalegari.bsky.social · 09/10/2025Inbox zero!!! It has to be close to a decade since the last time! *sobs* 180
dannycalegari.bsky.social @dannycalegari.bsky.social · 28/09/2025Just saw Paul Thomas Anderson's masterful documentary excuse me film "One Battle After Another" in the cinema. A masterpiece. I hope all the Christmas Adventure Club types on the right see it and wonder how PTA snuck a hidden camera into their country clubs. www.nytimes.com/2025/09/25/m...nytimes.com‘One Battle After Another’ Review: Paul Thomas Anderson’s Rallying Cry 180
dannycalegari.bsky.social @dannycalegari.bsky.social · 30/06/2025www.nytimes.com/2025/06/29/n... Good. Nice to hear some politician say it. By any measure, the existence of billionaires is a massive failure of economics and tax policy. Not even counting their corrosive effect on democracy, and Caligula-levels of personal crassness.nytimes.comWe Shouldn’t Have Billionaires, Mamdani Says 050
Reposted by @dannycalegari.bsky.socialBrian Cardone @cardonebrian.bsky.social · 18/06/2025🚨🚨The White House is pissed off about this ad so you know what to do, share it everywhere! ICE is disappearing people just because of the color of their skin! No Warrant! No Due Process! This is not who we are as Americans! #MAGAKidnappers want an all white America, fuck that‼️ 8342670918579
dannycalegari.bsky.social @dannycalegari.bsky.social · 06/06/2025How is it possible that Josh Hawley is on the right side and Dick Durbin is on the wrong side with respect to the GENIUS act? Broken clocks etc. www.nytimes.com/2025/06/06/b...nytimes.comHawley Breaks With Republicans to Oppose a Major Crypto Bill 150
dannycalegari.bsky.social @dannycalegari.bsky.social · 30/05/2025It's not the absolute worst thing the government is trying to do right now, but it might be close. The "GENIUS" act uses your tax dollars to guarantee and underwrite criminal activity, grift, Ponzi schemes and outright fraud. Write your senator!!! econjared.substack.com/p/crytpo-the...econjared.substack.comCrytpo: There's just no legit use case for it. But, man, are these bros lobbied up.Our looonnnggg take on why private digital currencies and the blockchain are an accident going out to happen. 140
dannycalegari.bsky.social @dannycalegari.bsky.social · 15/05/2025I wrote a fun little paper using triangulations to give a new construction of simple ReLU networks to compute arbitrary PL functions, and using hyperbolic geometry to (lower) bound the complexity of the construction. 020
