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FI-modules and counting points over finite fields Ellenberg, Jordan
Description
It is well-known by now that homological stability for a sequence of moduli spaces \(X_1, X_2, X_3\), over a finite field \(F_q\) sometimes translates into the existence of a limit for the point-count \[ q^{-dim X_n} |X_n(F_q)|. \] Sometimes you can tell a similar story about sequences of moduli spaces whose cohomology is representation (or: naturally forms a finitely generated module for some FI-like category.) This provides, for example, a geometric way of thinking about the distribution of irreducible factors of random polynomials and of irreducible factors of random maximal tori in algebraic groups over \(F_p\). I will also talk about work of Vlad Matei on the function-field Landau problem — how often is a random polynomial a sum of two squares? — and explain what this has to do with the category FI_B introduced by J. Wilson.
Item Metadata
Title |
FI-modules and counting points over finite fields
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Creator | |
Publisher |
Banff International Research Station for Mathematical Innovation and Discovery
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Date Issued |
2016-04-04T09:01
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Description |
It is well-known by now that homological stability for a sequence of moduli spaces \(X_1, X_2, X_3\), over a finite field \(F_q\) sometimes translates into the existence of a limit for the point-count
\[
q^{-dim X_n} |X_n(F_q)|.
\]
Sometimes you can tell a similar story about sequences of moduli spaces whose cohomology is representation (or: naturally forms a finitely generated module for some FI-like category.) This provides, for example, a geometric way of thinking about the distribution of irreducible factors of random polynomials and of irreducible factors of random maximal tori in algebraic groups over \(F_p\). I will also talk about work of Vlad Matei on the function-field Landau problem — how often is a random polynomial a sum of two squares? — and explain what this has to do with the category FI_B introduced by J. Wilson.
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Extent |
55 minutes
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Subject | |
Type | |
File Format |
video/mp4
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Language |
eng
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Notes |
Author affiliation: University of Wisconsin
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Series | |
Date Available |
2016-10-04
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0318068
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URI | |
Affiliation | |
Peer Review Status |
Unreviewed
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Scholarly Level |
Faculty
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International