Algebraic Geometry

Lecture course, Spring 2026


Remedios Varo, Vampiros vegatarianos, 1962
Remedios Varo Vampiros vegatarianos (1962)

Time: Tuesdays 11:30–12:50 & 13:30–14:50, Thursdays 11:30–12:50

Venue: KSE Dragon Capital building, Shpaka 3, room 4.07 (see KSE schedule for room changes)

Office hours: Thursdays, 10-11:30, Math department coworking space (floor 5.5), or by appointment

Description

Algebraic geometry is the study of algebraically defined geometric objects, such as algebraic varieties (roughly, zero sets of systems of polynomial equations in many variables, over an algebraically closed field) or schemes (spaces which locally “look like” the prime spectrum of a commutative ring. It has a close relationship with commutative algebra, differential geometry, complex analysis, number theory, and representation theory.

The goal of the course is to introduce the audience to the basic objects of study in algebraic geometry: algebraic varieties and schemes, and (sheaves of) modules over them. Emphasis will be put on concrete objects such as projective varieties. In order to keep the course focused, we will work toward a single main goal, which will be the proof of the Weil conjecture (Riemann hypothesis) for curves over a finite field.

Resources

Syllabus: [PDF]

External links: Moodle KSE Hub Slack Schedule

Commutative algebra cheat sheet: [PDF]

Problem sets: 1 (due Feb 5), 2 (due Feb 22), 3 (due Mar 1), 4 (due Mar 22)

Schedule

Jan 13 I.1 Introduction. Algebraic sets in $\mathbb{A}^n$ and $\mathbb{P}^n$.
Jan 15 I.2a Irreducible components, morphisms, spaces with functions, algebraic sets (Part 1)
Jan 20 no class
Jan 22 no class
Jan 27 I.2b Irreducible components, morphisms, spaces with functions, algebraic sets (Part 2)
Jan 29 I.3 Products. Separated and complete varieties.
Feb 3 I.4 Elimination theory
Feb 5 I.5 Local rings and rational maps
Feb 10 I.6 Nonsingular varieties
Feb 12 II.1 Sheaves
Feb 17 II.2 Schemes
Feb 19 II.3 More on schemes
Feb 24 II.4 Sheaves of modules
Feb 26 II.5 Quasi-coherent sheaves
Mar 3 no class
Mar 5 no class
Mar 10 II.6 Sheaves of ideals and locally free sheaves
Mar 12 II.7 Invertible sheaves on affine and projective spaces
Mar 17 II.8 Divisors
Mar 19 III.1 Cohomology
Mar 23 no class
Mar 25 no class
Mar 31 III.2 Cohomology of projective spaces
Apr 2 IV.1 Kaehler differentials
Apr 7 IV.2 Riemann–Roch
Apr 9 IV.3 Applications of Riemann–Roch
Apr 13 V.1 Intersection theory on surfaces
Apr 15 V.2 Application to point counting on curves
Apr 20 Bonus lecture
Apr 22 no class
Apr 27 no class
Apr 29 exam

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