Elliptic curves in positive characteristic, supersingular and ordinary curves, Weil conjecture for elliptic curves (or a subset of these topics). Reference: [15], V.2, V.3, possibly V.4.

Toric varieties: definition, classification in terms of fans, example of a toric complete nonprojective threefold. References: [7], [10] , [3].

Newton polytopes and Bernstein-Khovanski-Kushnirenko bound for the number of solutions of a system of "sparse" polynomial equations. Reference: [6].

Hurwitz Theorem bounding number of automorphisms of an algebraic curve, examples of groups realizing the bound (Hurwitz groups), the Klein quartic. Reference: [12], p. 337, 348; [1], pp. 44-47.

Cremona group of birational automorphisms of the plane: examples of finite subgroups, some results on classification of conjugacy classes. Reference: [8].

Some results and example on the construction of Hilbert schemes parametrizing subvarieties in a projective space. Reference: [14].

Rational double point surface singularities and finite subgroups in SL(2), classification in terms of simply-laced Dynkin graphs (*A*_{n}, *D*_{n}, *E*_{6}, *E*_{7}, *E*_{8}). Refrences: [2], [5], [9].

28 bitangents to a quartic plane curve and theta characteristics (square roots of the canonical line bundle). References: [11], [8].

Flag varieties of classical simple algebraic groups and their basic properties, Bruhat decomposition, count of points over a finite field. Reference: [4].

Examples of noncatenary commutative rings. Reference: [13].

## References

[1] Arbarello, Cornalba, Griths, Harris, *Geometry of Algebraic Curves*, Vol. I. Grundlehren der Mathematischen Wissenschaften [Fundamental Principles of Mathematical Sciences], 267. Springer-Verlag, New York, 1985.

[2] Artin, *On Isolated Rational Singularities of Surfaces.* American Journal of Mathematics 88 (1966), 129136.

[3] Bonavero, *Lectures on Toric Varieties*, Lecture 14.

[4] Brion, *Lectures on the Geometry of Flag Varieties*, available at arxiv.org.

[5] Burban, *Du Val Singularities* (PDF).

[6] Cox, Little, O'Shea, *Using Algebraic Geometry*, Graduate Texts in Mathematics, 185. Springer, New York, 2005.

[7] Danilov, *The Geometry of Toric Varieties.* Uspekhi Mat. Nauk 33 (1978), no. 2(200), 85-134, 247.

[8] Dolgachev, *Classical Algebraic Geometry: A Modern View*. Cambridge University Press, 2012.

[9] Durfee, *Fifteen Characterizations of Rational Double Points and Simple Critical Points.* L'Enseignement Mathematique. Revue Internationale. 25 (1979), 131163.

[10] Fulton, *Introduction to Toric Varieties*. Annals of Mathematics Studies, 131. The William H. Roever Lectures in Geometry. Princeton University Press, Princeton, NJ, 1993.

[11] Griffiths, Harris, *Principles of Algebraic Geometry*. Wiley-Interscience, 1994.

[12] Hartshorne, *Algebraic Geometry*, Graduate Texts in Mathematics. Springer, 1997. ISBN: 9780387902449. [Preview with Google Books]

[13] Heitmann, *Examples of Noncatenary Rings.* Trans. AMS, 247 (1979), 125-136.

[14] Nitsure, *Construction of Hilbert and Quot Schemes*, available at arxiv.org.

[15] Silverman, *Arithmetic of Elliptic Curves*, Graduate Texts in Mathematics, 106. Springer, Dordrecht, 2009.