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]

Lecture notes in one big file (version Apr 21): [PDF]

Problem sets: 1 (due Feb 5), 2 (due Feb 22), 3 (due Mar 1), 4 (due Mar 22), 5 (due Apr 16)

Schedule

Jan 13 1. Introduction. Algebraic sets in $\mathbb{A}^n$ and $\mathbb{P}^n$.
Jan 15 2a. Irreducible components, morphisms, spaces with functions, algebraic sets (Part 1)
Jan 20 no class
Jan 22 no class
Jan 27 2b Irreducible components, morphisms, spaces with functions, algebraic sets (Part 2)
Jan 29 3. Products. Separated and complete varieties.
Feb 3 4. Elimination theory
Feb 5 5. Local rings and rational maps
Feb 10 6. Nonsingular varieties
Feb 12 7. Sheaves
Feb 17 8. Schemes
Feb 19 9. More on schemes
Feb 24 10. Sheaves of modules
Feb 26 11. Quasi-coherent sheaves
Mar 3 no class
Mar 5 no class
Mar 10 12. Sheaves of ideals and locally free sheaves
Mar 12 13. Invertible sheaves on affine and projective spaces
Mar 17 14. Divisors
Mar 19 15. Cohomology
Mar 23 no class
Mar 25 no class
Mar 31 no class
Apr 2 16. Cohomology of projective spaces
Apr 7 17. Differentials
Apr 9 18. Riemann–Roch
Apr 14 19. More projective tools
Apr 16 20. Surfaces
Apr 21 21. Weil conjectures for curves
Apr 23 22. Algebraic Geometry Open Mic
Apr 28 no class
Apr 30 exam

Contact: