Graduate Algebraic Geometry Seminar Fall 2017

When: Wednesdays 4:00pm

Where:Van Vleck B139

Lizzie the OFFICIAL mascot of GAGS!!

Who: YOU!!

Why: The purpose of this seminar is to learn algebraic geometry by giving and listening to talks in a informal setting. Talks are typically accessible to beginning graduate students and take many different forms. Sometimes people present an interesting paper they find. Other times people give a prep talk for the Friday Algebraic Geometry Seminar. Other times people give a series of talks on a topic they have been studying in-depth.

How:If you want to get emails regarding time, place, and talk topics (which are often assigned quite last minute) add yourself to the gags mailing list: gags@lists.wisc.edu. The list registration page is here.

Give a talk!

We need volunteers to give talks this semester. If you're interested contact DJ, or just add yourself to the list (though in that case we might move your talk later without your permission). Beginning graduate students are particularly encouraged to give a talk, since it's a great way to get your feet wet with the material.

Wish List

If there is a subject or a paper which you'd like to see someone give a talk on, add it to this list. If you want to give a talk and can't find a topic, try one from this list.

• Sheaf operations on D-modules (the point is that then you can get a Fourier-Mukai transform between certain O-modules and certain D-modules, which is more or less how geometric Langlands is supposed to work)

• A careful explanation of the correspondence between graded modules and sheaves on projective varieties.

• Braverman and Bezrukavnikov: geometric Langlands correspondence for D-modules in prime characteristic: the GL(n) case (Note: this title sounds tough but prime characteristic makes things easier)

• Homological projective duality

• The orbit method (for classifying representations of a Lie group)

• Kaledin: geometry and topology of symplectic resolutions

• Kashiwara: D-modules and representation theory of Lie groups (Note: Check out that diagram on page 2!)

• Geometric complexity theory, maybe something like arXiv:1508.05788.

Fall 2015

Date	Speaker	Title (click to see abstract)
January 20	Jay Yang	Tropical Geometry II
January 27	TBD	TBD
February 3	Ed	Semiorthogonal Decomposition for Algebraic Varieties
February 10	Ed	Semiorthogonal Decomposition for Algebraic Varieties
February 17	TBD	TBD
February 24	DJ Bruce	Divisors and Stuff I
March 2	DJ Bruce	Divisors and Stuff II
March 9	DJ Bruce	Divisors and Stuff III
March 16	TBD	TBD
March 23	N/A	No GAGS This Week
March 30	TBD	TBD
April 6	TBD	TBD
April 13	TBD	TBD
April 20	TBD	TBD
April 27	TBD	TBD
May 4	TBD	TBD
May 11	TBD	TBD

January 20

Jay Yang

Title: Tropical Geometry II

Abstract: Previously we discussed the basic definitions of tropical geometry, and the connection to algebraic geometry. Now we use this to count curves through points on P^2. This is a well known result initially proven without the use of tropical tools. But using tropical tools we can give a proof that relies on the combinatorics of lattice paths. I will begin with a review of some facts from tropical geometry that we need for this proof.

January 27

TBD

Title: TBD

Abstract: TBD

February 3

TBD

Title: Semiorthogonal Decomposition for Algebraic Varieties

Abstract: I will explain some results from Bondal and Orlov's article of the same name. One interpretation of what it should mean to "compute" a triangulated category is to give a full exceptional sequence, or failing that a semiorthogonal decomposition into two categories that you are willing to pretend to understand. Bondal and Orlov did this for the intersection of two quadrics and for blowups. The strategy is to express one of the terms in the semiorthogonal decomposition as the image of a Fourier-Mukai transform. This is useful because they have a theorem (this is probably the "main content" of the paper) that lets you guarantee that the FM transform is full and faithful.

February 10

TBD

Title: Semiorthogonal Decompositions for Algebraic Varieties

Abstract: I will explain some results from Bondal and Orlov's article of the same name. One interpretation of what it should mean to "compute" a triangulated category is to give a full exceptional sequence, or failing that a semiorthogonal decomposition into two categories that you are willing to pretend to understand. Bondal and Orlov did this for the intersection of two quadrics and for blowups. The strategy is to express one of the terms in the semiorthogonal decomposition as the image of a Fourier-Mukai transform. This is useful because they have a theorem (this is probably the "main content" of the paper) that lets you guarantee that the FM transform is full and faithful.

February 17

TBD

Title: TBD

Abstract: TBD

February 24

DJ Bruce

Title: Divisors and Stuff I

Abstract: TBD

March 2

DJ Bruce

Title: Divisors and Stuff II

Abstract: TBD

March 9

DJ Bruce

Title: Divisors and Stuff III

Abstract: TBD

March 16

TBD

Title: TBD

Abstract: TBD

March 23

No Seminar This Week

Title: N/A

Abstract: Enjoy your break!

March 30

TBD

Title: TBD

Abstract: TBD

April 6

TBD

Title: TBD

Abstract: TBD

April 13

TBD

Title: TBD

Abstract: TBD

April 20

TBD

Title: TBD

Abstract: TBD

April 27

TBD

Title: TBD

Abstract: TBD

May 4

TBD

Title: TBD

Abstract: TBD

May 11

TBD

Title: TBD

Abstract: TBD

Organizers' Contact Info

DJ Bruce

Nathan Clement

Ed Dewey

Past Semesters

Fall 2015