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Introduction to Algebraic Geometry

NPTEL-NOC IITM via YouTube

Overview

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Explore the fundamental concepts of algebraic geometry through this comprehensive course that bridges commutative algebra and geometric structures. Begin with essential topics in commutative algebra including the Cayley-Hamilton theorem, Nakayama's lemma, and Noether normalization lemma, establishing the algebraic foundation necessary for geometric applications. Study affine algebraic sets and their properties, learning about regular morphisms, abstract algebraic sets, and the Zariski topology on affine spaces while developing understanding of irreducible affine algebraic sets and rings of regular functions. Investigate projective spaces and their geometric properties, covering Zariski topology on projective space, affine open covers, and the distinction between projective and quasi-projective varieties. Master the theory of presheaves and sheaves, including morphisms between these structures and their applications in algebraic geometry, with detailed exploration of sheaf theory fundamentals. Examine prevarieties and the sheaf of regular functions, understanding rings of germs, fields of rational functions, and the equivalence between categories of affine varieties and commutative algebras. Analyze various types of morphisms including open and closed immersions, diagonal morphisms, finite morphisms, and proper morphisms, while studying products of varieties and fiber products. Develop expertise in geometric concepts such as completeness, separatedness criteria, and the relationship between projective varieties and complete varieties. Explore differential geometric aspects including Zariski tangent spaces, singular and nonsingular points, smooth morphisms, and classical results like Bertini's theorem and Sard's theorem. Investigate advanced topics such as blow-ups, rational maps, birational maps, and dimension theory applications throughout the course. Conclude with an introduction to scheme theory through the spectrum of a ring, topology on Spec A, sheaf structures, and applications to abstract non-singular curves, providing a foundation for modern algebraic geometry.

Syllabus

Introduction To Algebraic Geometry - Course Introduction
Topics in Commutative Algebra - Part 1
Topics in Commutative Algebra - Part 2
Topics in Commutative Algebra - Part 3
Topics in Commutative Algebra - Part 4
Topics in Commutative Algebra - Part 5
Tutorial 1: Cayley-Hamilton Theorem, Nakayama's Lemma
Topics in Commutative Algebra: Part 6
Topics in Commutative Algebra: Part 7
Topics in Commutative Algebra: Part 8
Affine Algebraic Sets - Part 1
Affine Algebraic Sets - Part 2
Tutorial 2: Noether Normalization Lemma,Some Important Results in Dimension Theory
Regular Morphisms
Abstract Algebraic Sets
Zariski Topology on Affine Space
Irreducible Affine Algebraic Sets
Ring of Regular Functions
Projective Space
Tutorial 3: Some Applications of Dimension Theory
Zariski Topology on Projective Space
Affine Open Cover of Projective Space
Projective & Quasi-Projective Varieties
Regular Functions on Quasi-Projective Varieties
Presheaves & Sheaves
Morphism of Presheaves/Sheaves
Tutorial 4: More Applications of Dimension Theory
A Brief Overview of Sheaf Theory - Part 1
A Brief Overview of Sheaf Theory - Part 2
A Brief Overview of Sheaf Theory - Part 3
Prevarieties
Sheaf of Regular Functions
Ring of Germs of Regular Functions at a point, Field of Rational Functions
Tutorial 5: Sheafification
Ring of Regular Functions, Local Ring at a Point,and Field of Rational Functions of an AffineVariety
Equivalence of Categories of the Category of Affine Varieties over a Field k and the Category
Equivalence of Categories of the Category of Affine Varieties over a Field k (Contd.)
Some Examples, Open Immersions & Closed Immersions
Product of Quasi-affine Varieties
Diagonal Morphisms, Abstract Varieties
Tutorial 6: Normal Varieties & Normalization of a Variety
Projective Varieties Revisited: Part 1
Projective Varieties Revisited: Part 2
Global Regular Functions on ProjectiveVarieties are Constants : Part 1
Global Regular Functions on ProjectiveVarieties are Constants : Part 2
Product of Prevarieties : Part 1
Product of Prevarieties : Part 2
Tutorial 7 : A Result on Tensor Products of k-algebras
Morphisms of Prevarieties : Part 1
Morphisms of Prevarieties : Part 2
Finite Morphisms : Part 1
Finite Morphisms : Part 2
Fiber Products
Tutorial 8 : Finite Morphisms
Immersions
Fiber Products, Separatedness
Criterion of Separatedness
Proper Morphisms & Complete Varieties
Tutorial 9 : Closed Immersions & Graph of a Morphism
Projective Varieties are Complete
Zariski Tangent Space, Singular & Nonsingular Points
Smooth Points Form a Non-empty Open Subset
Blow-Ups, Rational Maps & Birational Maps
Tutorial 10 : Zariski Tangent Space at a Point of an Affine Variety
Blow-Ups ( Contd.)
Smooth Morphisms
Bertini's Theorem
Sard's Theorem
Tutorial 11 : Dimension of fiber of a morphism
Introduction to Affine Schemes : Spectrum of a Ring
Introduction to Affine Schemes : Topology on Spec A
Introduction to Affine Schemes : Topology on Spec A ( Contd. )
Introduction to Affine Schemes : Sheaf Structure on Spec A
Abstract Non-singular Curves : Part 1
Abstract Non-singular Curves : Part 2
Tutorial 12 : Extension of Regular Functions

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NPTEL-NOC IITM

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