This file can be used to add scheduled events to your calendar, however every program is unique. Below you will find what information is available, but if nothing else works try creating a new calendar in your program and using
http://math.colorado.edu/seminars/ics/frag.ics
as the source.
Thunderbird
The Algebraic Geometry Seminar, AKA FRAGMENT, meets at Boulder on Thursdays 11:15 AM -- 12:15 PM in MATH 350 and at CSU on Thursdays 3 -- 5 PM in Weber 201. For more information, or to provide a speaker, please contact Renzo Cavalieri, Jonathan Wise, or Sebastian (Yano) Casalaina.
Thu, Aug. 27 11:15pm (MATH …
Sebastian Casalaina-Martin and Jonathan Wise
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Our algebraic geometry research faculty, Sebastian (Yano) Casalaina-Martin and Jonathan Wise will each give a quick informal talk about their current research.
This is a great opportunity for new graduate students who are interested in working in algebraic geometry!
The moduli space of cubic surfaces with a marked line lies naturally between the moduli space of fully marked and unmarked cubic surfaces and comes equipped with a W(D_5)-action corresponding to the stabilizer of the marked line. Hodge theoretic compactifications of these moduli spaces have been extensively studied by many, including Allcock—Carlson—Toledo, Dolgachev—van Geemen—Kondo, and Casalaina-Martin—Grushevsky—Hulek. In previous work, by using KSBA wall crossing, we described many different birational models of this moduli space via KSBA stable pairs. In this talk, we will discuss recent results regarding the W(D_5)-invariant birational geometry of these KSBA moduli spaces and ongoing work on the log minimal model program for these KSBA moduli spaces with respect to their log canonical divisor.
The log MMP for the moduli space of cubic surfaces with a marked line
Thu, Oct. 1 11:15pm (MATH …
Sachi Hashimoto
X
Let X be a curve of genus at least 2. By Faltings’ theorem, we know that X has finitely many rational points, but how can we actually determine this set in practice? Around 40 years before Faltings’ proof, Chabauty proved this finiteness theorem for certain curves by studying the embedding of X inside an abelian variety, the Jacobian variety of X. In the first part of my talk, I will explain Chabauty’s original method and the modern day extension “Geometric linear Chabauty” that makes this effective. In the second part of my talk, I will describe recent progress to extend Chabauty’s method to a broader class of curves by studying line bundles over the Jacobian (arising from pullbacks of the Poincare bundle). The math in these talks arises out of work of Edixhoven and Lido, and also reflects joint work with Spelier, Lido, Lombardo, Mascot, and Parent.
Geometric methods for determining rational points on curves I and II
Thu, Oct. 8 11:15am (MATH …
Sachi Hashimoto
X
Let X be a curve of genus at least 2. By Faltings’ theorem, we know that X has finitely many rational points, but how can we actually determine this set in practice? Around 40 years before Faltings’ proof, Chabauty proved this finiteness theorem for certain curves by studying the embedding of X inside an abelian variety, the Jacobian variety of X. In the first part of my talk, I will explain Chabauty’s original method and the modern day extension “Geometric linear Chabauty” that makes this effective. In the second part of my talk, I will describe recent progress to extend Chabauty’s method to a broader class of curves by studying line bundles over the Jacobian (arising from pullbacks of the Poincare bundle). The math in these talks arises out of work of Edixhoven and Lido, and also reflects joint work with Spelier, Lido, Lombardo, Mascot, and Parent.
Geometric methods for determining rational points on curves I and II
We show that birational toric Landau–Ginzburg models which are related by a crepant variation of GIT have isomorphic state spaces under mild assumptions, generalizing the state space LG/CY correspondence of Chiodo–Ruan. We prove that this isomorphism is canonical, and is induced by a Fourier–Mukai transform. In the special case that a toric LG model is a so-called geometric phase, we identify the LG state space with the cohomology of the associated hypersurface.
The State Space Correspondence for Toric Landau-Ginzburg Models
Thu, Oct. 29 11:15am (MATH …
Shend Zhjeqi (Michigan)
X
TBD
TBD Sponsored by the Meyer Fund
Thu, Nov. 19 1pm (CSU)
FRAG Day
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Fall 2026 Front Range Algebraic Geometry Day at Colorado State University
This day is in collaboration with the FRAGMENT seminar for algebraic geometers in the front range area to connect and discuss their research. In particular, we are committed to fostering connections among graduate students between CU and CSU
For more information, please see our website: https://sites.google.com/colorado.edu/front-range-ag/home?authuser=0
AG Open House