Mon, 10 Feb 2025
14:15
L5

The Schubert variety of a hyperplane arrangement

Nick Proudfoot
(University of Oregon)
Abstract

I’ll tell you about some of my favorite algebraic varieties, which are beautiful in their own right, and also have some dramatic applications to algebraic combinatorics.  These include the top-heavy conjecture (one of the results for which June Huh was awarded the Fields Medal), as well as non-negativity of Kazhdan—Lusztig polynomials of matroids.

Castalian String Quartet

The Cultural Programme in association with the Faculty of Music, University of Oxford, bring the Castalian String Quartet’s incredible performances to Oxford through a series of chamber concerts and pre-show talks in the Holywell Music Room. 

Thermoelectric magnetohydrodynamic flow in a liquid metal-infused trench
Bond, O Howell, P Journal of Fluid Mechanics volume 1004 (28 Jan 2025)
Thu, 05 Dec 2024

16:00 - 17:00
Virtual

Transportation market rate forecast using signature transform

Dr Xin Guo
Further Information
Abstract

Freight transportation marketplace rates are typically challenging to forecast accurately. In this talk, I will present a novel statistical technique based on signature transforms and  a predictive and adaptive model to forecast these marketplace rates. Our technique is based on two key elements of the signature transform: one being its universal nonlinearity property, which linearizes the feature space and hence translates the forecasting problem into linear regression, and the other being the signature kernel, which allows for comparing computationally efficiently similarities between time series data. Combined, it allows for efficient feature generation and precise identification of seasonality and regime switching in the forecasting process. 

An algorithm based on our technique has been deployed by Amazon trucking operations, with far superior forecast accuracy and better interpretability versus commercially available industry models, even during the COVID-19 pandemic and the Ukraine conflict. Furthermore, our technique is in production in Amazon and has been adopted for Amazon finance planning,  with an estimated annualized saving of $50MM in the transportation sector alone. 

Non-Invertible Symmetries in 6d from Green-Schwarz Automorphisms
Apruzzi, F Schafer-Nameki, S Warman, A (14 Nov 2024)
On brane systems with O${}^+$ planes -- 5d and 6d SCFTs
Akhond, M Arias-Tamargo, G Carta, F Grimminger, J Hanany, A (04 Nov 2024) http://arxiv.org/abs/2411.02491v4
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