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 Jan 25)

Schedule

Jan 13 I.1 Introduction. Algebraic sets in $\mathbb{A}^n$ and $\mathbb{P}^n$.
Jan 15 I.2 Irreducible components, morphisms, spaces with functions.
Jan 20 I.3 Products of varieties. Elimination theory.
Jan 22 I.4 Tangent spaces and nonsingular varieties. Smooth curves.
Jan 27 II.1 Intro to schemes. Sheaves
Jan 29 II.2 Schemes and varieties
Feb 3 II.3 Morphisms of varieties
Feb 5 II.4 Separated and proper varieties
Feb 10 II.5 Coherent sheaves
Feb 12 II.5 Examples of coherent sheaves
Feb 17 III.1 Cohomology via flabby resolutions
Feb 19 III.2 Cohomology of affine schemes
Feb 24 III.3 Cohomology of projective spaces
Feb 26 IV.1 Intro to curves. Valuation criteria
Mar 3 no class
Mar 5 no class
Mar 10 IV.2 Riemann–Roch and corollaries
Mar 12 IV.3 Proof of Riemann–Roch
Mar 17 IV.4 Elliptic curves
Mar 19 V.1 Intro to surfaces. Intersection theory
Mar 23 no class
Mar 25 no class
Mar 31 V.2 Riemann–Roch for surfaces and the Hodge index theorem
Apr 2 V.3 Application to point counting on curves
Apr 7 Bonus lecture
Apr 9 no class
Apr 13 no class
Apr 15 exam

Contact: