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)

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 nonsingular varieties
Feb 10 II.1 Intro to schemes. Sheaves
Feb 12 II.2 Schemes and varieties
Feb 17 II.3 Morphisms of varieties
Feb 19 II.4 Separated and proper varieties
Feb 24 II.5 Coherent sheaves
Feb 26 II.5 Examples of coherent sheaves
Mar 3 no class
Mar 5 no class
Mar 10 III.1 Cohomology via flabby resolutions
Mar 12 III.2 Cohomology of affine schemes
Mar 17 III.3 Cohomology of projective spaces
Mar 19 IV.1 Intro to curves. Valuation criteria
Mar 23 no class
Mar 25 no class
Mar 31 IV.2 Riemann–Roch and corollaries
Apr 2 IV.3 Proof of Riemann–Roch
Apr 7 IV.4 Elliptic curves
Apr 9 V.1 Intro to surfaces. Intersection theory
Apr 13 V.2 Riemann–Roch for surfaces and the Hodge index theorem
Apr 15 V.3 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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