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X-WR-CALNAME:Center for Complex Geometry
X-ORIGINAL-URL:https://ccg.ibs.re.kr
X-WR-CALDESC:Events for Center for Complex Geometry
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BEGIN:VTIMEZONE
TZID:Asia/Seoul
BEGIN:STANDARD
TZOFFSETFROM:+0900
TZOFFSETTO:+0900
TZNAME:KST
DTSTART:20220101T000000
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END:VTIMEZONE
BEGIN:VEVENT
DTSTART;VALUE=DATE:20230301
DTEND;VALUE=DATE:20240229
DTSTAMP:20260417T100332
CREATED:20230425T013322Z
LAST-MODIFIED:20230504T065225Z
UID:2258-1677628800-1709164799@ccg.ibs.re.kr
SUMMARY:Insong Choe (최인송\, Konkuk University)
DESCRIPTION:Insong Choe (최인송) \nVisitor (2023.3.1-2024.2.28) from Konkuk University \nOffice: B255
URL:https://ccg.ibs.re.kr/event/230301-240228/
CATEGORIES:Visitors
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20231010T110000
DTEND;TZID=Asia/Seoul:20231010T120000
DTSTAMP:20260417T100332
CREATED:20230924T041001Z
LAST-MODIFIED:20230924T041001Z
UID:2534-1696935600-1696939200@ccg.ibs.re.kr
SUMMARY:Guolei Zhong\, Positivity of Tangent Sheaf of Projective Varieties
DESCRIPTION:    Speaker\n\n\nGuolei Zhong\nIBS-CCG\n\n\n\n\n\n\nIn this talk\, we discuss the structure of projective varieties with certain positive tangent sheaves. More precisely\, when the tangent sheaf is almost nef or positively curved\, we construct a well-defined MRC fibration and study the Fujita decomposition of reflexive sheaves. Besides\, we show that the almost nefness of the tangent sheaf will impose rather restrictive condition on the singularities\, and some typical examples will be given. This is based on my recent joint work with Masataka Iwai and Shin-ichi Matsumura.
URL:https://ccg.ibs.re.kr/event/2023-10-10/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20231016T110000
DTEND;TZID=Asia/Seoul:20231016T120000
DTSTAMP:20260417T100332
CREATED:20231010T015222Z
LAST-MODIFIED:20231010T015241Z
UID:2580-1697454000-1697457600@ccg.ibs.re.kr
SUMMARY:Gil Bor\, Cusps of Caustics by Reflection in a Convex Billiard Table
DESCRIPTION:    Speaker\n\n\nGil Bor\nCIMAT\n\n\n\n\n\n\nPlace a point light source inside a smooth convex billiard table (or mirror). The n-th caustic by reflection is the envelope of light rays after n reflections. Theorem: each of these caustics\, for a generic point light source\, has at least 4 cusps. Conjecture: there are exactly 4 cusps iff the table is an ellipse. Here are the 2nd\, 5th and 8th caustics by reflection in an ellipse\, each with 4 cusps (marked by gray disks; the light source is the white disk) \n \nThis is a billiard version of “Jacobi’s Last Geometric Statement”\, concerning the number of cusps of the conjugate locus of a point on a convex surface\, proved so far only in the n=1 case. (Joint work with Serge Tabachnikov\, from Penn State\, USA).
URL:https://ccg.ibs.re.kr/event/2023-10-16-1100-1200/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20231016T160000
DTEND;TZID=Asia/Seoul:20231016T170000
DTSTAMP:20260417T100332
CREATED:20231010T015627Z
LAST-MODIFIED:20231010T015627Z
UID:2584-1697472000-1697475600@ccg.ibs.re.kr
SUMMARY:Gil Bor\, Bicycle Tracks\, their Monodromy Invariants and Geodesics
DESCRIPTION:    Speaker\n\n\nGil Bor\nCIMAT\n\n\n\n\n\n\nAt first sight\, the pair of front and back wheel tracks left by a passing bike on a sandy or muddy terrain seems like a random pair of curves. This is not the case. For example\, one can usually distinguish between the front and back wheel tracks\, and even the direction at which these were traversed\, based solely on their shapes. You can try it for the following pair of paths. \n \nAnother example: If the front wheel traverses a small enough closed path (compared to the bike size)\, then\, typically\, the back track does not close up\, by an amount approximated by the area enclosed by the front track and the bicycle length; this fact was utilized to build a simple area measuring mechanical device\, now obsolete\, called the Hatchet planimeter. \nIn recent years the subject has attracted attention due to newly discovered relations with the theory of completely integrable systems (the filament flow)\, sub-Riemannian geometry and elasticity theory. I will try to describe some of these developments and open questions.
URL:https://ccg.ibs.re.kr/event/2023-10-16-1600-1700/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20231017
DTEND;VALUE=DATE:20231021
DTSTAMP:20260417T100332
CREATED:20230725T012006Z
LAST-MODIFIED:20231022T055239Z
UID:2391-1697500800-1697846399@ccg.ibs.re.kr
SUMMARY:Workshop on Parabolic Geometry and Related Topics
DESCRIPTION:Speakers\nGil Bor (CIMAT)\nAndreas Cap (U. Vienna)\nSean Curry (Oklahoma State U.)\nMike Eastwood (U. Adelaide)\nJaehyun Hong (IBS-CCG)\nJun-Muk Hwang (IBS-CCG)\nSung Yeon Kim (IBS-CCG)\nIlya Kossovskiy (Masaryk U.)\nBoris Kruglikov (U. Tromso)\nOmid Makhmali (PAS-CTP)\nBenjamin McMillan (IBS-CCG)\nTohru Morimoto (Nara Women’s U.)\nIgor Zelenko (Texas A&M) \nAbstracts\nPDF file \nSchedule\nOct. 17 \n10:00-11:00 Igor Zelenko\n11:30-12:30 Ilya Kossovskiy\n15:00-16:00 Gil Bor\n16:30-17:30 Sung Yeon Kim \nOct. 18 \n10:00-11:00 Andreas Cap\n11:30-12:30 Jun-Muk Hwang\n14:30-15:30 Benjamin McMillan \nOct. 19 \n10:00-11:00 Sean Curry\n11:30-12:30 Omid Makhmali\n15:00-16:00 Tohru Morimoto\n16:30-17:30 Jaehyun Hong \nOct. 20 \n10:00-11:00 Boris Kruglikov\n11:30-12:30 Mike Eastwood \nOrganizer\nJun-Muk Hwang (IBS-CCG) \nVenue\nB109\, IBS\, Daejeon\, Korea \nMore Information\n• How to get to IBS-CCG
URL:https://ccg.ibs.re.kr/event/2023-10-17-20/
LOCATION:B109\, IBS\, Korea\, Republic of
CATEGORIES:Conferences and Workshops
ATTACH;FMTTYPE=image/jpeg:https://ccg.ibs.re.kr/wp-content/uploads/2023/07/Workshop-on-parabolic-geometry-group-photo-scaled.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20231025T110000
DTEND;TZID=Asia/Seoul:20231025T120000
DTSTAMP:20260417T100332
CREATED:20231022T054758Z
LAST-MODIFIED:20231022T054814Z
UID:2594-1698231600-1698235200@ccg.ibs.re.kr
SUMMARY:Yotsutani Naoto\, Chow Stability and Non-symmetric Kähler-Einstein Toric Fano Manifolds
DESCRIPTION:    Speaker\n\n\nYotsutani Naoto\nKagawa University\n\n\n\n\n\n\nIn 2001\, Donaldson proved that if a polarized manifold (X\, L) admits constant scalar curvature Kähler metrics in c1(L)\, then (X\, L) is asymptotically Chow stable whenever its automorphism group Aut(X\, L) is discrete. \nIn this talk\, we show that this result does not hold in the case where Aut(X\, L) is not discrete. \nThis talk is based on a joint work with H. Ono and Y. Sano.
URL:https://ccg.ibs.re.kr/event/2023-10-25/
LOCATION:B266\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
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