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PRODID:-//Center for Complex Geometry - ECPv6.15.20//NONSGML v1.0//EN
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X-ORIGINAL-URL:https://ccg.ibs.re.kr
X-WR-CALDESC:Events for Center for Complex Geometry
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X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Asia/Seoul
BEGIN:STANDARD
TZOFFSETFROM:+0900
TZOFFSETTO:+0900
TZNAME:KST
DTSTART:20230101T000000
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END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240507T160000
DTEND;TZID=Asia/Seoul:20240507T170000
DTSTAMP:20260416T143315
CREATED:20240308T031240Z
LAST-MODIFIED:20240308T031240Z
UID:3004-1715097600-1715101200@ccg.ibs.re.kr
SUMMARY:Shigeyuki Kondo\, A Review on Enriques Surfaces: Moduli\, Automorphism Groups and Positive Characteristics\, I
DESCRIPTION:    Speaker\n\n\nShigeyuki Kondo\nNagoya University\n\n\n\n\n\n\nThe Enriques surface was discovered\, in 1894 by Federigo Enriques\, as a counter-example of a rationality problem.\nFirst I would like to recall the moduli space and the automorphism groups of Enriques surfaces over the complex numbers.\nIn the later half\, I shall mention a recent progress in positive characteristic\, especially in characteristic two.
URL:https://ccg.ibs.re.kr/event/2024-0507/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240508T110000
DTEND;TZID=Asia/Seoul:20240508T120000
DTSTAMP:20260416T143315
CREATED:20240308T031423Z
LAST-MODIFIED:20240308T031423Z
UID:3006-1715166000-1715169600@ccg.ibs.re.kr
SUMMARY:Shigeyuki Kondo\, A Review on Enriques Surfaces: Moduli\, Automorphism Groups and Positive Characteristics\, II
DESCRIPTION:    Speaker\n\n\nShigeyuki Kondo\nNagoya University\n\n\n\n\n\n\nThe Enriques surface was discovered\, in 1894 by Federigo Enriques\, as a counter-example of a rationality problem.\nFirst I would like to recall the moduli space and the automorphism groups of Enriques surfaces over the complex numbers.\nIn the later half\, I shall mention a recent progress in positive characteristic\, especially in characteristic two.
URL:https://ccg.ibs.re.kr/event/2024-0508/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240513T143000
DTEND;TZID=Asia/Seoul:20240513T153000
DTSTAMP:20260416T143315
CREATED:20240308T031601Z
LAST-MODIFIED:20240422T004325Z
UID:3009-1715610600-1715614200@ccg.ibs.re.kr
SUMMARY:Hsueh-Yung Lin\, Motivic Invariants of Birational Automorphisms of Threefolds
DESCRIPTION:    Speaker\n\n\nHsueh-Yung Lin\nNational Taiwan University\n\n\n\n\n\n\nThe motivic invariant c(f) of a birational automorphism f : X – → X measures the difference between the birational types of the exceptional divisors of f and those of the inverse f-1. In general c(f) is nonzero: this is the case when f is some Cremona transformation\, which leads to new explanation as to why Cremona groups are not simple. In the other direction\, which will be the main focus of the talk\, we show that the invariant c(f) always vanishes when X is a complex projective threefold. (joint work in progress with E. Shinder.)
URL:https://ccg.ibs.re.kr/event/2024-0513-1430-1530/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240513T160000
DTEND;TZID=Asia/Seoul:20240513T170000
DTSTAMP:20260416T143315
CREATED:20240308T031735Z
LAST-MODIFIED:20240420T084747Z
UID:3011-1715616000-1715619600@ccg.ibs.re.kr
SUMMARY:Ching-Jui Lai\, Anticanonical Volume of Singular Fano Threefolds
DESCRIPTION:    Speaker\n\n\nChing-Jui Lai\nNational Cheung Kung University\n\n\n\n\n\n\nThe set of canonical Fano threefolds form a bounded family by results of Kawamata\, Mori-Miyaoka-Kollar-Tagaki\, and in a much more general setting by Birkar. In particular\, the anticaonical volume –KX3 is bounded. An optimal lower bound is 1/330 by the work of Chen-Chen. In this talk\, we discuss the problem of identifying an optimal upper bound of –KX3.
URL:https://ccg.ibs.re.kr/event/2024-0513-1600-1700/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20240514
DTEND;VALUE=DATE:20240517
DTSTAMP:20260416T143315
CREATED:20240305T011448Z
LAST-MODIFIED:20240517T022906Z
UID:2985-1715644800-1715903999@ccg.ibs.re.kr
SUMMARY:Workshop on Algebraic Geometry in Busan
DESCRIPTION:Speakers\nLorenzo Barban (IBS-CCG)\nJungkai Chen (National Taiwan University)\nToshiyuki Katsura (University of Tokyo)\nShigeyuki Kondo (Nagoya University)\nChing-Jui Lai (National Cheung Kung University)\nDonggun Lee (IBS-CCG)\nHsueh-Yung Lin (National Taiwan University)\nShigeru Mukai (Kyoto University)\nKeiji Oguiso (University of Tokyo) \nAbstracts\nPDF file \nSchedule\nMay 14 (Tuesday) \n14:00~14:20 Registration\n14:20~15:20 Oguiso\n15:40~16:40 Lai\n17:00~18:00 Lin\n18:30~20:30 Dinner \nMay 15 (Wednesday) \n09:30~10:30 Katsura\n11:00~12:00 Kondo\n12:00~13:30 Lunch\n13:30~17:30 Discussion\n18:00~20:00 Banquet \nMay 16 (Thursday) \n09:30~10:30 Chen\n11:00~12:00 Barban\n12:00~13:30 Lunch\n13:30~14:30 Lee\n15:00~16:00 Mukai \nOrganizers\nJongHae Keum (KIAS)\nYongnam Lee (IBS-CCG/KAIST) \nVenue\nLa Valse Hotel\, Busan \n* Due to available hotel rooms and budgets\, participation is by invitation only. If you are interested to participate in this workshop\, please contact one of the organizers by April 15.
URL:https://ccg.ibs.re.kr/event/2024-0514-0516/
LOCATION:La Valse Hotel\, Busan\, Korea\, Republic of
CATEGORIES:Conferences and Workshops
ATTACH;FMTTYPE=image/jpeg:https://ccg.ibs.re.kr/wp-content/uploads/2024/05/IMG_6536-scaled.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240517T160000
DTEND;TZID=Asia/Seoul:20240517T170000
DTSTAMP:20260416T143315
CREATED:20240308T031917Z
LAST-MODIFIED:20240422T004620Z
UID:3014-1715961600-1715965200@ccg.ibs.re.kr
SUMMARY:Jungkai Chen\, Threefold Divisorial Contraction to Curves
DESCRIPTION:    Speaker\n\n\nJungkai Chen\nNational Taiwan University\n\n\n\n\n\n\nThe minimal model program works pretty well in dimension three. However\, the explicit classification of divisorial contractions to points was completed quite recently thanks to the work of Kawamata\, Hayakawa\, Kawakita and more. In this talk\, we are going to describe threefold divisorial contractions to curves. We will demonstrate some more possible higher dimensional extensions. This is joint work in progress with Jheng-Jie Chen and Hsin-Ku Chen.
URL:https://ccg.ibs.re.kr/event/2024-0517/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240521T160000
DTEND;TZID=Asia/Seoul:20240521T170000
DTSTAMP:20260416T143315
CREATED:20240410T120353Z
LAST-MODIFIED:20240507T000023Z
UID:3057-1716307200-1716310800@ccg.ibs.re.kr
SUMMARY:Shigeru Mukai\, Moduli of Abelian Surfaces\, Polyhedral Groups and Fano 3-folds of Degree 22 (Part 1)
DESCRIPTION:    Speaker\n\n\nShigeru Mukai\nRIMS\, Kyoto University\n\n\n\n\n\n\nI will discuss the moduli space of abelian surfaces with bi-level structure of type (1\, d) for d = 2\, 3\, 4\, 5. \nPart 1: Their Satake compactification is the projective 3-space P3 for d = 2\, 3\, 4. \nPart 2: It is a small contraction of the blow-up of P3 at 60 points for d = 5. I give two proofs. One is analytic and uses good automorphic forms constructed by Gritsenko-Nilulin. The other is algebraic and uses U22\, one of the Umemura 3-folds\, and Reye congruences.
URL:https://ccg.ibs.re.kr/event/2024-0521/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240522T160000
DTEND;TZID=Asia/Seoul:20240522T170000
DTSTAMP:20260416T143315
CREATED:20240410T120510Z
LAST-MODIFIED:20240513T070853Z
UID:3059-1716393600-1716397200@ccg.ibs.re.kr
SUMMARY:Shigeru Mukai\, Moduli of Abelian Surfaces\, Polyhedral Groups and Fano 3-folds of Degree 22 (Part 2)
DESCRIPTION:    Speaker\n\n\nShigeru Mukai\nRIMS\, Kyoto University\n\n\n\n\n\n\nI will discuss the moduli space of abelian surfaces with bi-level structure of type (1\, d) for d = 2\, 3\, 4\, 5. \nPart 1: Their Satake compactification is the projective 3-space P3 for d = 2\, 3\, 4. \nPart 2: It is a small contraction of the blow-up of P3 at 60 points for d = 5. I give two proofs. One is analytic and uses good automorphic forms constructed by Gritsenko-Nilulin. The other is algebraic and uses U22\, one of the Umemura 3-folds\, and Reye congruences.
URL:https://ccg.ibs.re.kr/event/2024-0522/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240523T110000
DTEND;TZID=Asia/Seoul:20240523T120000
DTSTAMP:20260416T143315
CREATED:20240229T044631Z
LAST-MODIFIED:20240508T084936Z
UID:2973-1716462000-1716465600@ccg.ibs.re.kr
SUMMARY:Sung Rak Choi\, Adjoint Asymptotic Multiplier Ideal Sheaves
DESCRIPTION:    Speaker\n\n\nSung Rak Choi\nYonsei University\n\n\n\n\n\n\nIn this talk\, we define and study a triple called a potential triple which consists of a pair (X\, Δ) and a polarizing pseudoeffective divisor D. \nTo such a triple\, we define a so-called potential multiplier ideal sheaf which gives a simultaneous generalization of the multiplier ideal sheaf and asymptotic multiplier ideal sheaf. We give a description of the closed subset defined by potential multiplier ideal sheaf in terms of the minimal model program. We also characterize the case where potential multiplier ideal sheaf is trivial. Lastly\, we also prove a Nadel type vanishing theorem of cohomology for potential multiplier ideal sheaf. We further present applications of the theory of potential triples. This is a joint work with S.Jang and D.Kim.
URL:https://ccg.ibs.re.kr/event/2024-0523/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
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