# PDF Sheaves and Homological Algebra: Lecture 1 [Lecture notes]

I will explain a different point of view wherein there is an enlargement of the Fukaya category which admits as additional objects certain analytic sheaves on this parameter space. The focus will be on a situation where technical difficulties are avoided by excluding holomorphic disc bubbling.

Complementary lecture by Jingyu Zhao : Convergence of the differential in family Floer homology Following Mohammed Abouzaid's lectures, I will first recall the differential for the family Floer complex between a tautologically unobstructed Lagrangian and fibres of a Lagrangian torus fibration of the symplectic manifold.

Using the works of Fukaya and Groman-Solomon, we explain that the family Floer differential constructed above can be viewed as a convergent function on an affinoid domain of the rigid analytic mirror. Notes by Kevin Sackel: lecture 1 , lecture 2 , lecture 3 , complements 1 , complements 2.

The goal of this lecture series will be to illustrate homological mirror symmetry by focusing on some simple examples. Along the way we will encounter wrapped and partially wrapped Fukaya categories of these spaces and their mirrors. While the basic examples may seem elementary, they illustrate general features of homological mirror symmetry and provide test cases for work in progress on hypersurfaces in toric varieties.

Derived symplectic linear algebra. Examples of symplectic and Lagrangian derived stacks. Topological field theories from shifted symplectic structures. Homological algebra and sheaves 2. Micro-support of sheaves, involutivity, Morse theory 3. Complementary lectures by Pierre Schapira : 1. Complements and examples 2. Examples of microsupports, links with D-modules.

Notes by the speaker. Quantization of exact Lagrangians in cotangent bundle I 3. Quantization of exact Lagrangians in cotangent bundle II. We will associate a sheaf to a given compact exact Lagrangian submanifold of a cotangent bundle and see how to deduce that this Lagrangian has the homotopy type of the base. Complementary lecture by Nicolas Vichery : Examples of quantization of Lagrangian submanifolds, quantization of Hamiltonian isotopies.

Notes by Sheridan , solutions to exercises by Maydanskiy Notes taken by Dingyu Yang: lecture 1 , lecture 2 , lecture 3 , complements 1 , complements 2. Notes by Amiel Peiffer-Smadja: lectures 1,2,3. Lagrangian Floer cohomology: We will introduce the basics of Lagrangian Floer cohomology, using the Arnold conjecture as motivation. This will involve discussing the Novikov field, transversality, compactness and gluing.

Product structures: We will introduce the Fukaya category, and give example computations. We will discuss obstructions, and how to deal with them. Triangulated structure: This talk will focus on the triangulated structure of the derived Fukaya category. Examples will include the relationship between Lagrangian surgery and cones, and Seidel's long exact sequence for a Dehn twist. Complementary lectures by Maksim Maydanskiy : In these supplementary sessions we will take up, in the form of exercise solutions, some additional material on Lagrangian Floer cohomology and Fukaya category as described the first two talks of N.

With audience participation, we will select for discussion a few topics from the following: interpretation of holomorphic strips as gradient flowlines of the action functional, explicit examples of Gromov convergence, gradings and computations of Floer cohomology in real dimension 2, relations of holomorphic discs to displacement energy, identification of Morse-Witten and Floer complexes in the cotangent bundle case , Stasheff associahedra and moduli of holomorphic discs.

## Advanced Algebraic Geometry, Universiteit Leiden, Fall 2013

Sheng-Fu Chiu : Sheaf-theoretic invariant and non-squeezability of contact balls. We apply microlocal category methods to a contact non-squeezing conjecture proposed by Eliashberg, Kim and Polterovich. In this talk I want to explain such phenomenon as well as the construction of those strutures.

The Gromov-Witten invariants play a central role in the mirror symmetry conjecture which in turn gives predictions for these invariants. Many such predictions for closed Gromov-Witten invariants have been established mathematically. Similar predictions exist for open and real Gromov-Witten invariants and I will discuss some of the difficulties related to understanding the open invariants and recent advances in the real case. I will then if time permits also discus some consequences of this. Since its discovery in the 60s, Yang-Baxter equation YBE has been studied extensively as the master equation in integrable models in statistical mechanics and quantum field theory.

## Algebraic Geometry (代数几何) II (Spring ) | Home page Eduard Looijenga

In , Polishchuk discovered a connection between the solutions to Yang-Baxter equations classical, associative and quantum and the Massey products in a Calabi-Yau 1-category, and using this he was able to construct geometrically some of the trigonometric solutions of the YBE coming from simple vector bundles on cycles of projective lines.

We first prove a homological mirror symmetry statement, hence see these trigonometric solutions to YBE via the Fukaya category of punctured tori. Next, we consider Fukaya categories of higher genus square-tiled surfaces to give a geometric construction of all the trigonometric solutions to associative Yang-Baxter equation parametrized by the associative analogue of the Belavin-Drinfeld data.

This is based on joint work with Polishchuk. I will survey recent work devoted to singularities of Lagrangian skeleta, with a focus on applications to mirror symmetry. We consider the symplectic cohomology of the total space of a Lefschetz fibration.

Under suitable assumptions, this can be equipped with a connection an operator of differentiation with respect to the Novikov variable. We will show that with respect to this operator, the Borman-Sheridan class satisfies a nonlinear first order differential equation a Riccati equation. I will sketch an argument that the wrapped Fukaya category localizes to a cosheaf of categories on a Lagrangian skeleton, locally modeled on the cosheaf dual to the Kashiwara-Schapira sheaf.

This is joint work with Sheel Ganatra and John Pardon. Recent work of Haiden, Katzarkov and Kontsevich leads to a classification of objects in derived wrapped Fukaya categories of punctured surfaces. We will describe an attempt to partially extend this classification to closed surfaces of higher genus, and discuss possible applications of such an extension.

### Lecture notes

This is joint speculation-in-progress with Denis Auroux. I am planning to overview my preprint arXiv The properties of this category are similar to those of the Fukaya category. The talk is based on joint work with Xin Jin. This is supposed to be an analog of the De Thames definition of cohomology of manifolds as opposed to the sheaf theoretical definition. I will address the local to global gluing question only briefly. Beginning with a cubic, planar graph, I will define a Legendrian surface in the cosphere bundle of three-space, equivalently the first jet bundle of the two-sphere.

Its wavefront projects generically two-to-one onto the base two-sphere, but is one-to-one over the graph.

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The Lagrangian defines a singular support condition for both a category of constructible sheaves and for a Fukaya category. I will describe the moduli space of objects of this category, and study two applications. First, the moduli space can be defined over a finite field, in which case the number of points can be related to the chromatic polynomial of the dual graph. Using this observation, I will show that none of the Lagrangian surfaces admits a smooth, exact Lagrangian filling in six-space. Instead, I will describe the construction of fillings which are not exact, and in fact obstructed.

Second, the moduli space sits as a Lagrangian submanifold of a symplectic period domain. It has a cover which is exact in a cotangent. Generalizing Aganagic-Vafa mirror symmetry, I will exhibit this Lagrangian in examples as the graph of the differential of a superpotential written as an integral linear combination of dilogarithms in special coordinates. The superpotential conjecturally encodes the Ooguri-Vafa invariants, and with them the open Gromov-Witten invariants of the obstructed Lagrangian. This is joint work with David Treumann.

We present a flexibility result with applications in the computation of holomorphic invariants of Lagrangian and Legendrian submanifolds. A major obstruction to extending these results to higher dimensions is the fact that generically Legendrian fronts have terrible singularities, rendering the combinatorics intractable. This is just one of many examples where one would like a Lagrangian or Legendrian front to have singularities that are as simple as possible.

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About this book This book and the following second volume is an introduction into modern algebraic geometry. Show all. Sheaves Pages Harder, Prof.

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