Witt vectors, semirings, and total positivity
The algebra-topology seminar covers topics in Algebra and Topology
Date & time
Date/time
28 Feb 2023 | 3 - 4pm
Speaker
Speakers
James Borger, MSI
Event series
Event series
Contact
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Description
Abstract:
I’ll explain how the big Witt vector construction can be defined without using subtraction, thus extending it to a functor on all semirings. I’ll describe explicitly the Witt vectors of the natural numbers and of the non-negative reals, where it essentially Schoenberg’s classical notion of total positivity. I’ll also discuss Frobenius flows and a possible connection with Deninger’s hypothetical spaces.
Location
Seminar Room 1.33
Hanna Neumann Building 145
Science Road
Acton ACT 2601
-35.275387198178, 149.11925554276