Here's a snippet from the current series of 'Me and My Maths', excellently edited by Evan. Tommy is a visiting student. 

Covering integers by x2 + dy2
Green, B Soundararajan, K Journal of the Institute of Mathematics of Jussieu volume 24 issue 3 847-889 (18 Mar 2025)
Forty years of the Ellis–Baldwin test
Secrest, N von Hausegger, S Rameez, M Mohayaee, R Sarkar, S Nature Reviews Physics volume 7 issue 2 68-70 (06 Jan 2025)
On a conjecture of Marton
Gowers, T Green, B Manners, F Tao, T Annals of Mathematics volume 201 issue 2 515-549 (12 Mar 2025)
Tue, 27 May 2025
14:00
L6

Differential graded algebras with entire functional calculus

Jon Pridham
(Edinburgh University)
Abstract

(EFC-DGAs) lead to an algebraic approach to derived analytic geometry, pioneered for more general Fermat theories by Carchedi and Roytenberg.
 
They are well-suited to modelling finite-dimensional analytic spaces, and classical theorems in analysis ensure they give a largely equivalent theory to Lurie's more involved approach via pregeometries. DG dagger affinoid spaces provide a well-behaved class of geometric building blocks whose homotopy theory is governed by the underlying EFC-DGAs. 

Time permitting, I might also say a little about non-commutative generalisations.
 

Green Templeton's annual Ceilidh is in our building again this year on the evening of Friday 24th January at 9.30 pm and we have been reserved 30 free tickets which you can access using the following link and access code.

Burns Night Tickets[ Code: GTCMATHS25

Please use your maths email addresses when booking tickets.

A new mechanochemical vertex model with Ca2+ signalling, for apical constriction in neural tube closure
Chakraborty, A Phillips, T Christodoulou, N Skourides, P Maini, P Baker, R Kaouri, K
Thu, 23 Jan 2025
16:00
Lecture Room 4

Continuity of heights and complete intersections in toric varieties

Michal Szachniewicz
(University of Oxford)
Abstract

I will describe the contents of a joint project with Pablo Destic and Nuno Hultberg. In the paper we confirm a conjecture of Roberto Gualdi regarding a formula for the average height of the intersection of twisted (by roots of unity) hyperplanes in a toric variety. I will introduce the 'GVF analytification' of a variety, which is defined similarly as the Berkovich analytification, but with norms replaced by heights. Moreover, I will discuss some motivations coming from (continuous) model theory and Arakelov geometry.

Deep neural networks have an inbuilt Occam’s razor
Mingard, C Rees, H Valle-Pérez, G Louis, A Nature Communications volume 16 issue 1 (14 Jan 2025)
Thu, 23 Jan 2025

11:00 - 12:00
L5

A new axiom for Q_p^ab and non-standard methods for perfectoid fields

Leo Gitin
(University of Oxford)
Abstract

The class of henselian valued fields with non-discrete value group is not well-understood. In 2018, Koenigsmann conjectured that a list of seven natural axioms describes a complete axiomatisation of Q_p^ab, the maximal extension of the p-adic numbers Q_p with abelian Galois group, which is an example of such a valued field. Informed by the recent work of Jahnke-Kartas on the model theory of perfectoid fields, we formulate an eighth axiom (the discriminant property) that is not a consequence of the other seven. Revisiting work by Koenigsmann (the Galois characterisation of Q_p) and Jahnke-Kartas, we give a uniform treatment of their underlying method. In particular, we highlight how this method yields short, non-standard model-theoretic proofs of known results (e.g. finite extensions of perfectoid fields are perfectoid).

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