Center for Complex Geometry

Cylindricity of weighted singular del Pezzo surfaces defined over fields of characteristic zero
2026-04-02 14:00 - 15:00 (Asia/Seoul) | B236-1, IBS, Korea, Republic of
Speaker

Dae-Won Lee
Ewha Womans University

The study of cylinders in normal projective varieties is of significant interest due to their intrinsic link to unipotent group actions on affine algebraic varieties. Over a field $mathbb{k}$ of characteristic zero, it is known that cylindricity in lower-dimensional varieties (appearing as generic fibers) implies the existence of vertical cylinders in higher-dimensional fibered spaces. In this talk, we give a criterion for the cylindricity of $mathbb{k}$-forms of a singular del Pezzo surface obtained as a blow-up of a weighted projective plane. Moreover, using the aforementioned criterion, we construct a Fano 3-fold which contains a vertical cylinder. This is joint work with In-Kyun Kim and Masatomo Sawahara.

Anticanonical minimal model program: examples and applications
2026-04-03 14:00 - 15:00 | B236-1, IBS, Korea, Republic of
Speaker

Dae-Won Lee
Ewha Womans University

This talk provides a brief survey of recent results and applications concerning the anticanonical minimal model program. Furthermore, we present examples of varieties that admit an anticanonical minimal model despite not being Mori dream spaces. This talk is based on joint work with Sung Rak Choi, Sungwook Jang and Donghyeon Kim.

Seminar week on Moduli, Birational Geometry, and related topics
2026-05-27 - 2026-05-29 | B236-1, IBS, Korea, Republic of
Speakers
Shigeyuki Kondo (Nagoya University)
JongHae Keum (KIAS)
Fei Si (Xi’an Jiaotong University)
Kyoung-Seog Lee (POSTECH)
Sang-Bum Yoo (Gongju National University of Education)
Junchao Shentu (USTC)
Haesong Seo (IBS-CCG/KAIST)
Minzhe Zhu (KIAS)
Yen-An Chen (KIAS)
Abstracts
TBA
Schedule
May 27(Wed)
15:00-16:00, Shigeyuki Kondo
16:30-17:30, JongHae Keum
May 28(Thu)
11:00-12:00, Fei Si
13:30-14:30, Kyoung-Seog Lee
15:00-16:00, Sang-Bum Yoo
16:30-17:30, Junchao Shentu
May 29(Fri)
10:00-11:00, Haesong Seo
11:20-12:20, Minzhe Zhu
14:00-15:00, Yen-An Chen
Organizers
Yongnam Lee (IBS-CCG)
Venue
B236-1, IBS, Daejeon, Korea
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TBA
2026-05-27 11:00 - 12:00 | B236-1, IBS, Korea, Republic of
Speaker

Hyunmoon Kim
Ewha Womans University

TBA

Conference on Complex Geometry
2026-11-09 - 2026-11-13 | IBS Science Culture Center, Daejeon, Korea, Republic of
Speakers
Rodolf Aguilar Aguilar (CIMAT, Guanajuato)
Cong Ding (Shenzhen U.)
Cecil Gachet (U. Bochum)
Jaehyun Hong (IBS-CCG)
Xiaojun Huang (Rutgers U.)
Yuta Kusakabe (Kyushu U.)
Minseong Kwon (AMSS, Beijing)
Suichung Ng (ECNU, Shanghai)
Dan Popovici (U. Toulouse)
Vasily Rogov (MPI, Leipzig)
Min Ru (U. Houston)
William Sarem (U. Grenoble)
Aeryeong Seo (Kyungpook National U.)
Laurent Stolovitch (U. Nice)
Shigeharu Takayama (U. Tokyo)
Sheng-Li Tan (ECNU, Shanghai)
Wing-Keung To (National U. Singapore)
I-Hsun Tsai (National Taiwan U.)
Julie Wang (Academia Sinica, Taipei)
Kwok Kin Wong (Shenzhen U.)
Abstracts
TBA
Schedule
TBA
Organizers
Philippe Eyssidieux (U. Grenoble)
Jun-Muk Hwang (IBS-CCG)
Sung Yeon Kim (IBS-CCG)
Ngaiming Mok (U. Hong Kong)
Venue
Science Culture Center, IBS, Daejeon, Korea
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