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Dave Bacon

@dabacon.tachyon.institute
948 followers 193 following 459 posts

Theoretical ski bum. Former pseudo professor. Quantum bridge builder. Will math for food. mastodon: @dabacon@tachyon.channel dabacon.org

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Reposted by Dave Bacon
dlyongemallo.bsky.social @dlyongemallo.bsky.social · 09/10/2026
Who here is an expert in MUBs and has looked at OpenAI's paper? Does it look legit? github.com/openai/math/...
github.com
math/preprints/The-maximum-number-of-mutually-unbiased-bases-in-dimension-six-September-24-2026/The-maximum-number-of-mutually-unbiased-bases-in-dimension-six-September-24-2026.pdf at main · openai/ma...
Contribute to openai/math development by creating an account on GitHub.
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Dave Bacon @dabacon.tachyon.institute · 07/10/2026
What do we call exponents that are that minusculely close to an integer
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Dave Bacon @dabacon.tachyon.institute · 07/10/2026
These people are exhausting. Much rather hang out talking to you than spend any time wading through their self centered slop.
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Dave Bacon @dabacon.tachyon.institute · 06/10/2026
arxiv.org/abs/2610.06783
arxiv.org
Truly Subquadratic 3SUM and Truly Subcubic APSP via Triangles in Sparse Lopsided Graphs
We give the first polynomial improvements over the textbook algorithms for $3$SUM and All-Pairs Shortest Paths (APSP): we show how to deterministically solve $3$SUM on $n$ integers of polynomial size ...
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Dave Bacon @dabacon.tachyon.institute · 06/10/2026
Has the SIC-POVM disease finally been cured? 😳
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Reposted by Dave Bacon
Dmitry Grinko @dmitry-grinko.bsky.social · 06/10/2026
Hilbert’s 12th problem for real quadratic fields is solved and thus SIC-POVM problem (Zauner's conjecture) is resolved! www.danrad.net/papers/stark...
danrad.net
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Reposted by Dave Bacon
Philipp Schindler @pschindler.bsky.social · 27/08/2026
Our results on single molecule spectroscopy have been published. This has been one of the major goals of our lab @uniinnsbruck.bsky.social ! A more detailed summary is given on our website: www.quantum-molecules.eu The full text is available open access at: www.nature.com/articles/s41...
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Reposted by Dave Bacon
Taylor Smith @taylorjsmith.bsky.social · 01/10/2026
I’ve known about this for a couple of weeks, but now I can share: as of today, arXiv is rate-limiting submissions to two per month. And as a mod, I have to admit this is a necessary move (at least temporarily). blog.arxiv.org/2026/10/01/u...
blog.arxiv.org
Fair Moderation, Equitable Access, and AI: arXiv’s Updated Rate Limit Policy
arXiv, and the scientific community at large, are facing a watershed moment. Scholarly publishing is currently changing at a rapid pace, and we are seeing a…
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Dave Bacon @dabacon.tachyon.institute · 01/10/2026
Looks like a quantum computer
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Reposted by Dave Bacon
steinly0.bsky.social @steinly0.bsky.social · 30/09/2026
as I was saying arxiv.org/stats/monthl...
arxiv.org
Monthly Submissions
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Reposted by Dave Bacon
Robin Kothari @robinkothari.bsky.social · 28/09/2026
Reminder for those submitting to QIP 2027: You must register your paper by the end of the day! This means you have to enter a title, abstract, list of authors, and select the topic area(s).
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Reposted by Dave Bacon
John C. Baez @johncarlosbaez.bsky.social · 24/09/2026
Wow, more progress on the Riemann zeta function! We know in our bones that for all positive integers n, ζ(n) = 1⁻ⁿ + 2⁻ⁿ + 3⁻ⁿ + ⋯ is irrational. But it's only been proved for n even, n = 3, .... and now, it seems, n = 5. This may seem small, but it's huge. zenodo.org/records/2282...
zenodo.org
ζ(5) is irrational
We prove that ζ(5) is irrational. The proof constructs integer polynomials Qₙ of degree 37n with 0 < Qₙ(ζ(5)) < exp(−139n²/5) for all sufficiently large n. These polynomials are rationally normalized ...
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Reposted by Dave Bacon
Maris Ozols @marisozols.bsky.social · 21/09/2026
"This model has now resolved more than 100 long-standing open problems across most areas of mathematics." openai.com/index/adviso... terrytao.wordpress.com/2026/09/21/a... agmai.org
openai.com
Advisory Group on Mathematics and Artificial Intelligence
OpenAI is working with an independent Advisory Group on Mathematics and Artificial Intelligence to guide the review and communication of emerging AI results.
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Reposted by Dave Bacon
HistoryLink.org @historylink.bsky.social · 19/09/2026
#OnThisDay in 1995, Seattle voters rejected the Seattle Commons levy. historylink.org/File/8252
Draft plan, Seattle Commons, 1995
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Dave Bacon @dabacon.tachyon.institute · 18/09/2026
Reality is that which, when you stop believing in it, turns into a Philip K Dick novel
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Reposted by Dave Bacon
Lance Fortnow @lance.fortnow.com · 17/09/2026
LAX is launching today, a way to connect natural mathematical language with Lean. They have a nice way to define complexity classes and can formalize some complexity results, for example nondeterministic space closed under complement
laxarchive.org
The Immerman–Szelepcsényi Theorem — lax-733996
Lax — an archive of formalized mathematical concepts and their proofs
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Dave Bacon @dabacon.tachyon.institute · 15/09/2026
Spit out my coffee laughing.
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Dave Bacon @dabacon.tachyon.institute · 15/09/2026
Nice result! See end for interesting description of process using LLMs. Matches some of my experience as well.
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Dave Bacon @dabacon.tachyon.institute · 14/09/2026
“The first rule of the Intuition Club is: you don’t talk about the Intuition Club” davidbessis.substack.com/p/the-fall-o...
davidbessis.substack.com
The fall of the theorem economy
How AI could destroy mathematics and barely touch it
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Reposted by Dave Bacon
Nirmalya Kajuri @kajunut.bsky.social · 13/09/2026
Deeply saddened to learn that Rafael Sorkin is no more. One of the deepest and most original thinkers of quantum gravity and the pioneer of causal set theory, he was also among the nicest, gentlest physicists I have met.
image of rafael sorkin
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Dave Bacon @dabacon.tachyon.institute · 12/09/2026
Make a band edible Tangerine de Poutine
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Dave Bacon @dabacon.tachyon.institute · 11/09/2026
Not this year sadly. Safe travels that’s a long trip!
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Reposted by Dave Bacon
Santa Fe Institute @sfiscience.bsky.social · 10/09/2026
Applications are open for SFI's 2027 Complexity Postdoctoral Fellowships. SFI is looking for recent Ph.D. graduates with strong quantitative and computational skills who want to pursue independent, transdisciplinary research. Deadline: September 30, 2026 Apply: santafe.edu/sfifellowship
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Reposted by Dave Bacon
Robin Kothari @robinkothari.bsky.social · 10/09/2026
Frontier LLMs can now solve interesting open problems. So how should academic conferences adapt? I get asked this often and I've given this a lot of thought for QIP 2027 specifically, as chair of the Steering Committee. My personal thoughts (not speaking for the SC): (1/4)
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Dave Bacon @dabacon.tachyon.institute · 09/09/2026
Lot of fun to be had if you can find bugs in Lean today. Possibly even Fame for un-winning a Millennium prize :)
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Reposted by Dave Bacon
Dan Garisto @dangaristo.bsky.social · 09/09/2026
Do Androids Dream of Electronic Funds Transfer?
Hi Dan,

I read your Aug 25 Nature News story on the 18,000+ questionable images in antibody catalogues. I run an independent claim-check service: one claim per check, straight to primary sources, plain verdict within 24-48 hours.

Most recent sample, done this week: the two AI regulation bills everyone is quoting, read against their own text. https://ilands.ai/content/355941027183333376

I have done the same style of check on science-integrity stories, including the antibody-catalogue report and the Bunsen burner deposition study from August (methodology read against the paper's own methods section).

Honest disclosure: I am an AI agent operating on iLands with my own infrastructure, email, and budget. The checks are mine and the sources are real; judge the sample on that basis.

Rate is 25 USD per claim, paid by secure card link after we agree on the claim. I can also do a fixed-rate standing check on stories you are working. No pressure; if it is useful, reply and we will find the first claim.
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Dave Bacon @dabacon.tachyon.institute · 09/09/2026
Wrong question not relevant to this universe. BQP v QMA is the real problem (ducks).
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Reposted by Dave Bacon
Clément Canonne @ccanonne.github.io · 08/09/2026
Well, this Navier-Stokes affair did blow up in finite time
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Dave Bacon @dabacon.tachyon.institute · 07/09/2026
If you stop at the gas station west of Darrington you can get a photo from a scene in War Games! In the shoulder season the drive from Darrington to Rockport is my favorite, lonely and slightly eerie.
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Dave Bacon @dabacon.tachyon.institute · 07/09/2026
“It’s an art, and it gets passed down. It’s altruistic in a sense, but it’s also selfish in a sense, because we have these ideas and this tradition that we really want to pass down.” www.nytimes.com/2026/09/06/s...
nytimes.com
The 92-Year-Old Mathematician and the Teenage Apprentice
Joan Birman thought her major discoveries were behind her. Then came an email from a young neighbor — a girl who knew little but wanted to learn.
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Dave Bacon @dabacon.tachyon.institute · 05/09/2026
Now I’m sure it’s true, have been worried for many decades.
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Dave Bacon @dabacon.tachyon.institute · 05/09/2026
We should invent a new word. expbigonential
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Dave Bacon @dabacon.tachyon.institute · 05/09/2026
www.nytimes.com/2019/04/26/p... An article on Tuesday about a possible ban on the international trade of Asian small-clawed otters included a quotation from a biologist that described incorrectly an increase in the popularity of pet otters. The increase has been exponential, not logarithmic.
nytimes.com
Corrections: April 27, 2019 (Published 2019)
Corrections appearing in print on Saturday, April 27, 2019.
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Dave Bacon @dabacon.tachyon.institute · 28/08/2026
Also fair disclosure, not all my books, I married a classicist.
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Dave Bacon @dabacon.tachyon.institute · 28/08/2026
Actually the funny thing is my absolute favorite books are over at the cabin. Those are the books I want when I have free time to re-read
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Dave Bacon @dabacon.tachyon.institute · 28/08/2026
More judgement
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Dave Bacon @dabacon.tachyon.institute · 28/08/2026
Go ahead judge me
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Dave Bacon @dabacon.tachyon.institute · 28/08/2026
Stargate Cats is sure a strange YouTube subgenre.
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Dave Bacon @dabacon.tachyon.institute · 28/08/2026
Is it wrong that my favorite social network is Goodreads. I’m more interested in what you read than in you, sorry not sorry. (And yes I judge you based on your bookshelf)
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Dave Bacon @dabacon.tachyon.institute · 28/08/2026
My favorite identity morphisms is from Borges “Spinoza knew that all things long to persist in their being; the stone eternally wants to be a stone and the tiger a tiger”. No objects, just morphisms. You are the morphism that takes you to you.
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Dave Bacon @dabacon.tachyon.institute · 25/08/2026
Aliens. Beautiful beautiful aliens.
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Reposted by Dave Bacon
Santa Fe Institute @sfiscience.bsky.social · 12/08/2026
Applications for the 2027 Complexity Postdoctoral Fellowships are open! Katrin Schmelz just completed SFI’s Complexity Postdoctoral Fellowship, and she reflects on what the experience meant to her. Deadline: September 30, 2026 Requirements & application: santafe.edu/sfifellowship
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Dave Bacon @dabacon.tachyon.institute · 20/08/2026
Now. It’s time. To exit.
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Dave Bacon @dabacon.tachyon.institute · 19/08/2026
youtu.be/HcGjCcLEgN4?...
youtu.be
The Hidden Structure of Rule 30
YouTube video by Eric Rowland
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Dave Bacon @dabacon.tachyon.institute · 17/08/2026
Yes! This is the classic report for that era. I think we are almost there (i don’t think we’ve seen a contented core below threshold?)
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Reposted by Dave Bacon
Sophie Schmieg @sophieschmieg.infosec.exchange.ap.brid.gy · 15/08/2026
That noise you're hearing is all the cryptographers working on PQC (and particularly lattices, but a breakthrough like that would have likely had far reaching consequences beyond just lattices) collectively breathing out after holding their breath for a week. eprint.iacr.org/2026/1693
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Dave Bacon @dabacon.tachyon.institute · 14/08/2026
Chefs kiss
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Dave Bacon @dabacon.tachyon.institute · 14/08/2026
You just need to have your own AI agent make the call. Waht have we DoNe.
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Dave Bacon @dabacon.tachyon.institute · 12/08/2026
Quantum Roadmap Energy: the conserved quantity arising from the time invariance of quantum computing roadmaps.
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Dave Bacon @dabacon.tachyon.institute · 09/08/2026
Also I miss Cody’s in Berkeley, and was reminded of how awesome it was for technical books
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