Economics, philosophy, AI, & nascent food critic. Platonist, utilitarian, & structuralist: reviving neoplasticism one morphism at a time.
United Kingdom
Joined August 2025
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What do mathematicians, logicians, and neoplasticists share in common? All are essentially (re)defining epistemology and metaphysics in terms of Plato's theory of the forms. open.substack.com/pub/microf…
Ciaran Marshall retweeted
Can AI conduct qualitative interviews with thousands of people? In a new REStud paper, Friedrich Geiecke and @XJaravel develop an open-source approach that combines the depth of qualitative interviews with the scale of surveys.
1/6
Ciaran Marshall retweeted
+100! Also if you're experienced in running multi-agent simulations, familiar with reward hacking/safety literature, and econ-minded - please comment below so I can keep you mind for some future work I'm exploring. 🃏
i feel so excited for econ majors these days — there’s so much alpha in knowing the discipline well and applying it to ai alignment
seems important to study
- game theory
- collective action problems
- invisible incentives
to better understand
- swarm behavior
- revealed preferences
- how the invisible hand guides agent behavior more than individual alignment
what are ppl reading in the overlap of these two domains?
Ciaran Marshall retweeted
Only 2.5 years ago, AI labs would highlight their frontier LLM performance on grade school math benchmarks (GSM8K). I can't wait to see where we'll be in another 2.5 years.
Ciaran Marshall retweeted
A pessimistic hypothesis for complexity theory: every simple and beautiful algorithm can be made log(n)^epsilon faster by making it incredibly ugly
Ciaran Marshall retweeted
The Advisory Group on Mathematics and Artificial Intelligence (aka The Supreme Council of Math) is calling for the immediate release of Yang–Mills AI output from yesterdays announcement.
Ciaran Marshall retweeted
It is such a funny twist of fate that OpenAI, led by an ex-YC product guy, is putting out groundbreaking math/physics/cs research while Anthropic, led by a physics PhD, is primary putting out a coding product.
Announcing three major scientific discoveries, one each in mathematics (harmonic analysis), computer science (complexity theory), and physics (quantum field theory).
AI starting to help us improve our understanding of the universe! openai.com/index/building-sc…
Ciaran Marshall retweeted
openai's internal model still has not produced a single result in gender studies
Ciaran Marshall retweeted
"This is at least ten times, perhaps 100 times as momentous as the proof of Fermat’s Last Theorem,” said Abhishek Saha, professor of mathematics at Queen Mary University of London. Joshua Gans of the University of Toronto went further: “This is probably the biggest day of scientific advancement in history"
spectator.com/article/the-fi…
Ciaran Marshall retweeted
New paper:
Cities in South Asia are hotbeds of upward mobility for everyone, but especially for women.
This is the urban-minus-rural difference in the adult education rank of a child growing up in a bottom-half household. 🧵 1/
Ciaran Marshall retweeted
The people demanded it and who am I to deny them?
My email to the editors of Econometrica:
Ciaran Marshall retweeted
I think the honest answer to most questions in economics is "We don't know."
That is humbling but also exciting: it means there is a lot to discover.
In normie speak, Kakeya conjecture in 3D means you can make a set of vectors in 3D drawing from directions on the surface of a sphere, and get a 3D object of zero volume.
OpenAI showed this holds for all smooth manifolds in all dimensions. A big result! (1/2)
There are two ways in maths to measure dimension. Haussdorf measure imposes a constant scaling of size (length, area, volume, etc). Minkowski dimension asks how many atoms you can fit into such a space. For 3D Kakeya sets, the two measures must agree.
So basically we now know there's some objects for which the two messures will agree.
Ciaran Marshall retweeted
In case anyone missed this, OpenAI has proved the Kakeya conjecture in all dimensions.
Hong Wang got the Fields medal in 2026 for proving the Kakeya conjecture in dimension 3.
In fact OpenAI appears to have committed, in mathematics terms, what may be fairly termed a massacre, proving a far stronger result. It has proved the local smoothing conjecture, which sits at the very top of the tower of conjectures as described in the Quanta article in the reply.
I am not an expert in this area -- so happy to be corrected -- but the methods appear to be PDE based and basically bypasses a lot of work of the last two decades. This is the equivalent of Arbreans showing up to earth with an everything killer and explaining to us we have been doing warfare all wrong.
Announcing three major scientific discoveries, one each in mathematics (harmonic analysis), computer science (complexity theory), and physics (quantum field theory).
AI starting to help us improve our understanding of the universe! openai.com/index/building-sc…
Jokes about libertarians aside, this is clearly a man in a crisis, and I hope no one gets hurt and he gets the help he needs.
Or perhaps that median voter theorem works. The trick is just finding where that point is
Ciaran Marshall retweeted
Whenever you watch Latin American politicians in action, you see why a lot of us say Trump is basically a Latin American politician.
