[Alta-Logic] Peripatetic seminar this Friday

[Florian Schwarz]

Dear all,

I am very happy to announce that this Friday, *Sept 19th 2025 at 2pm* 
(one hour earlier than last week) we will hear from Durgesh Kumar in the 
peripatetic seminar.

Title: Sheaf theoretic structure of contextuality

Abstract: In this talk, I will present Abramsky and Brandenburger’s 
sheaf-theoretic framework of non-locality and contextuality in quantum 
theory. We will begin by setting up the mathematical framework of sheaf 
theory and empirical models. I will present in detail the central 
theorem, which gives a correspondence between the existence of local 
hidden variables, at the ontological model and the empirical model 
having a global section, at the operational level.
We will use Bell’s model as our running example to exhibit the 
non-existence of the global section using linear algebraic methods. We 
will see how this framework leads to a hierarchy of no-go theorems in 
quantum theory. The formalism presented here applies to any compatible 
empirical model (quantum theory being one of them), and thus has 
applications in topics beyond quantum. Time permitting, we will comment 
on a couple of them.

Location: ICT 616

Website: https://logic.ucalgary.ca/event/durgesh-kumar-2/

Hope to see you all there!

Best regards,

Florian Schwarz
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