복소기하학연구단
Speaker Haesong Seo KAIST / IBS A projective manifold is called hyperbolic if it does not admit an entire map from the complex plane. Demailly proved that hyperbolic manifolds are algebraically hyperbolic, meaning that there are degree bounds for curves in terms of their genera. It is a highly challenging problem to determine …
Speaker Qifeng Li Shandong University Let X be a smooth equivariant compactification of a symmetric space. In this talk, we will discuss when a minimal rational curve on X is the orbit closure of a 1-parameter group. In case the symmetric space is of group type, the answer is positive and moreover the …
Speaker Yong Hu Shanghai Jiao Tong University In this talk, we will introduce the 3-dimensional Noether inequality and completely classify the canonical threefolds on the Noether line with $p_g \ge 5$ by studying their moduli spaces. For every such moduli space, we establish an explicit stratification, estimate the number of its irreducible components …
Speaker Minseong Kwon Gyeongsang National University In the 1970s, Demazure studied the automorphism groups of two types of almost homogeneous varieties: rational homogeneous spaces and toric varieties. Especially, for a smooth complete toric variety, Demazure obtained a structure theorem for the connected automorphism group in terms of the so-called Demazure roots. In this …
Speakers Lecture Series (3hr) Radu Laza (Stony Brook University) Matthias Schütt (Leibniz Universität Hannover) Jenia Tevelev (University of Massachusetts Amherst) Research Talks (1hr) Kenneth Ascher (University of California, Irvine) Dori Bejleri (University of Maryland, College Park) Harold Blum (Georgia Institute of Technology) Nathan Chen (Harvard University) Changho Han (Korea University) Donggun Lee (IBS-CCG) Samouil …
Speaker Jong Taek Cho Chonnam National University We survey recent developments of pseudo-Hermitian geometry or CR geometry of hypersurface type, with a particular focus on their symmetries and realizations as real hypersurfaces in Hermitian symmetric spaces.
The talks will begin on December 16, following a day of free discussion on December 15. Confirmed Speakers Lorenzo Barban (IBS-CCG) Junho Choe (KIAS) Karl Christ (University of Turin) Fei Hu (Nanjing University) Sukmoon Huh (Sungkyunkwan University) Jaehyun Kim (Ewha Womans University) Jeong-Seop Kim (KIAS) Shin-Young Kim (Kangwon National University) Haidong Liu (Sun Yat-sen University) …
Speaker Gebhard Martin University of Bonn The automorphism group of a general Enriques surface is the 2-congruence subgroup of the Weyl group of the E10-lattice. In particular, it is infinite and not virtually solvable. On the other end of the spectrum, there do exist Enriques surfaces with finite automorphism group, first classified over …
Speaker Kyoung-Seog Lee POSTECH Intersections of two quadrics form an interesting class of algebraic varieties and they have been intensively studied from various aspects. In these talks, I will discuss these various aspects of the intersection of two quadrics and how to interpret/generalize some of the classical algebraic geometry results using the derived …
Speaker Kyoung-Seog Lee POSTECH Intersections of two quadrics form an interesting class of algebraic varieties and they have been intensively studied from various aspects. In these talks, I will discuss these various aspects of the intersection of two quadrics and how to interpret/generalize some of the classical algebraic geometry results using the derived …
Speaker Sui-Chung Ng ECNU A complex algebraic surface is called an elliptic surface if it is a fiber surface whose general fibers are elliptic curves. An elliptic surface can also be regarded as an elliptic curve $E$ over the function field $K$ of an algebraic curve. The holomorphic sections of that elliptic surface …
Speaker Yun Gao Shanghai Jiao Tong U Hilbert's 17-th problem asked whether a non-negative polynomial in several real variables must be a sum of squares of rational functions. There is also a quantitative version of Hilbert's 17th problem which asks how many squares are needed. D'Angelo extend this problem to more general case …