Positivity in Algebraic Geometry
A.Y. 2025/2026
Course offered to students on the PhD programme in
Visit the PhD website for the course schedule and other information
Lead instructor: Roberto Svaldi
0) Basic notions: fiber bundles, divisors, morphisms; linear, algebraic and numerical equivalence; fundamentals of intersection theory.
1) Ampleness and nefness: basic definitions; the various classical characterizations of ampleness (cohomological via Serre vanishing and bundle-theoretic via global generation); Nakai-Moishezon criterion for amplitude; an intersection theoretic characterization of nefness via Kleiman's theorem; Q- and R-divisors; the cone of effective curves; Kleiman's criterion for ampleness via cones of divisors and curves; Hodge index type inequalities.
2) Bigness: Iitaka's theorem on morphisms induced by linear systems; definition of Iitaka and Kodaira dimensions; definition of bigness and pseudo-effectiveness; the cone of big and pseudo-effective divisors; the volume function and its properties; finite generation of rings of sections and Zariski's criterion.
3) Introduction to the ideas of higher-dimensional birational geometry: a survey of ideas/techniques/results of the last 50 years on birational classification of algebraic varieties over the complex numbers.
1) Ampleness and nefness: basic definitions; the various classical characterizations of ampleness (cohomological via Serre vanishing and bundle-theoretic via global generation); Nakai-Moishezon criterion for amplitude; an intersection theoretic characterization of nefness via Kleiman's theorem; Q- and R-divisors; the cone of effective curves; Kleiman's criterion for ampleness via cones of divisors and curves; Hodge index type inequalities.
2) Bigness: Iitaka's theorem on morphisms induced by linear systems; definition of Iitaka and Kodaira dimensions; definition of bigness and pseudo-effectiveness; the cone of big and pseudo-effective divisors; the volume function and its properties; finite generation of rings of sections and Zariski's criterion.
3) Introduction to the ideas of higher-dimensional birational geometry: a survey of ideas/techniques/results of the last 50 years on birational classification of algebraic varieties over the complex numbers.
Undefined
Assessment methods
Giudizio di approvazione
Assessment result
superato/non superato
How to enrol
Deadlines
The course enrolment deadline is usually the 27th day of the month prior to the start date.
How to enrol
- Access enrolment on PhD courses online service using your University login details
- Select the desired programme and click on Registration (Iscrizione) and then on Register (Iscriviti)
Ignore the option "Exam session date” that appears during the enrolment procedure.
Contacts
For help please contact [email protected]
Professor(s)
Reception:
By appointment (to be agreed upon via email)
Room 2102, Dipartimento di Matematica "F. Enriques", Via Saldini 50