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PRODID:-//Center for Complex Geometry - ECPv6.15.20//NONSGML v1.0//EN
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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:20230101T000000
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END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240611T110000
DTEND;TZID=Asia/Seoul:20240611T120000
DTSTAMP:20260416T110334
CREATED:20240410T120654Z
LAST-MODIFIED:20240610T000002Z
UID:3061-1718103600-1718107200@ccg.ibs.re.kr
SUMMARY:Minyoung Jeon\, Prym-Brill-Noether Loci and Prym-Petri Theorem
DESCRIPTION:Zoom ID: 880 6763 5837\nPW: 312515 \n\n\n    Speaker\n\n\nMinyoung Jeon\nUniversity of Georgia\n\n\n\n\n\n\nPrym varieties are abelian varieties constructed from etale double covers of algebraic curves. In 1985\, Welters equipped Prym varieties with Brill-Noether loci. In this talk\, we will describe the Prym-Brill-Noether loci with special vanishing at up to two marked points and will then give K-classes of the pointed and two-pointed Prym-Brill-Noether locus. As applications of the K-class formulas of the Prym-Brill-Noether loci\, we will also provide formulas for Euler characteristics of the pointed Prym-Brill-Noether loci and coupled Prym-Petri theorem.
URL:https://ccg.ibs.re.kr/event/2024-0611-1100-1200/
LOCATION:on-line
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240611T160000
DTEND;TZID=Asia/Seoul:20240611T170000
DTSTAMP:20260416T110334
CREATED:20240425T082421Z
LAST-MODIFIED:20240529T003804Z
UID:3117-1718121600-1718125200@ccg.ibs.re.kr
SUMMARY:Eric Sommers\, Some Slodowy Slices Associated to Special Nilpotent Orbits
DESCRIPTION:    Speaker\n\n\nEric Sommers\nUniversity of Massachusetts\n\n\n\n\n\n\nAmong the nilpotent orbits in a simple Lie algebra are the special nilpotent orbits\, which play an important role in representation theory. Some of the geometry of the closure of a nilpotent orbit can be understood by taking a transverse slice to a smaller orbit in the closure. This talk concerns a classification of two types of such transverse slices: (1) those between adjacent special nilpotent orbits; and (2) those between a special nilpotent orbit and a certain non-special nilpotent orbit in its closure. The slices in part (1) exhibit a duality\, which extends an observation of Kraft and Procesi for type A. The slices in part (2) are related to a conjecture of Lusztig on special pieces.  This talk is based on two preprints with Baohua Fu\, Daniel Juteau\, and Paul Levy.
URL:https://ccg.ibs.re.kr/event/2024-0611-1600-1700/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240613T110000
DTEND;TZID=Asia/Seoul:20240613T120000
DTSTAMP:20260416T110334
CREATED:20240411T030606Z
LAST-MODIFIED:20240603T194549Z
UID:3070-1718276400-1718280000@ccg.ibs.re.kr
SUMMARY:Cheol Hyun Cho\, Floer Theory for the Variation Operator of an Isolated Singularity
DESCRIPTION:    Speaker\n\n\nCheol Hyun Cho\nSeoul National University\n\n\n\n\n\n\nThe variation operator in singularity theory maps relative homology cycles to compact cycles in the Milnor fiber using the monodromy. We construct its symplectic analogue for an isolated singularity. We define a new Floer cohomology\, called monodromy Lagrangian Floer cohomology\, which provides categorifications of the standard theorems on the variation operator and the Seifert form. We discuss examples of plane curve singularities and explain the relation between exceptional collections of non-compact curves and distinguished collections of vanishing cycles.
URL:https://ccg.ibs.re.kr/event/2024-0613/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Complex Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240618T110000
DTEND;TZID=Asia/Seoul:20240618T120000
DTSTAMP:20260416T110334
CREATED:20240410T120832Z
LAST-MODIFIED:20240610T000025Z
UID:3063-1718708400-1718712000@ccg.ibs.re.kr
SUMMARY:Myeongjae Lee\, Connected Components of the Strata of Residueless Meromorphic Differentials
DESCRIPTION:Zoom ID: 880 6763 5837\nPW: 312515 \n\n\n    Speaker\n\n\nMyeongjae Lee\nStony Brook University\n\n\n\n\n\n\nStrata of differentials are interesting objects studied in various fields such as Teichmuller dynamics\, topology and algebraic geometry. Generalized strata are subsets of the strata of meromorphic differentials\, where certain sets of residues summing up to zero. We present the classification of the connected components of the strata of residueless meromorphic differentials\, using a degeneration technique to the boundary of a nice compactification of strata.
URL:https://ccg.ibs.re.kr/event/2024-0618/
LOCATION:on-line
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240624T140000
DTEND;TZID=Asia/Seoul:20240624T150000
DTSTAMP:20260416T110334
CREATED:20240410T121020Z
LAST-MODIFIED:20240522T084547Z
UID:3065-1719237600-1719241200@ccg.ibs.re.kr
SUMMARY:Kisun Lee\, Introduction to Numerical Algebraic Geometry
DESCRIPTION:    Speaker\n\n\nKisun Lee\nClemson University\n\n\n\n\n\n\nNumerical algebraic geometry employs numerical techniques for problems in algebraic geometry. This talk begins with a question reminding the meaning of solving a (polynomial) equation. It overviews the homotopy continuation as a method for finding solutions to a system of polynomial equations. After problems from algorithmic and application points of view in numerical nonlinear algebra are introduced\, we discuss how the results from numerical techniques can be certified. No pre-knowledge from graduate-level algebraic geometry is assumed.
URL:https://ccg.ibs.re.kr/event/2024-0624-1400-1500/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240624T160000
DTEND;TZID=Asia/Seoul:20240624T170000
DTSTAMP:20260416T110334
CREATED:20240410T121134Z
LAST-MODIFIED:20240522T084608Z
UID:3067-1719244800-1719248400@ccg.ibs.re.kr
SUMMARY:Kisun Lee\, Numerical Certification and Certified Homotopy Tracking
DESCRIPTION:    Speaker\n\n\nKisun Lee\nClemson University\n\n\n\n\n\n\nA certified algorithm produces a solution and a certificate of correctness to a problem. Numerical certification studies certified algorithms for results obtained from numerical methods in algebraic geometry. In this talk\, we discuss why numerical certification is needed in numerical algebraic geometry and introduce the Krawczyk homotopy as one of its methods. The Krawczyk homotopy exploits interval arithmetic to track the homotopy solution path without path jumping so that the correctness of its output is guaranteed. This is joint work with Timothy Duff.
URL:https://ccg.ibs.re.kr/event/2024-0624-1600-1700/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240625T110000
DTEND;TZID=Asia/Seoul:20240625T120000
DTSTAMP:20260416T110334
CREATED:20240420T085030Z
LAST-MODIFIED:20240520T012527Z
UID:3109-1719313200-1719316800@ccg.ibs.re.kr
SUMMARY:Euisung Park\, On Rank 3 Quadratic Equations of Projective Varieties
DESCRIPTION:    Speaker\n\n\nEuisung Park\nKorea University\n\n\n\n\n\n\nMany projective varieties are ideal-theoretically cut out by quadratic polynomials of rank less than or equal to 4. Classical constructions in projective geometry like rational normal scrolls and Segre-Veronese varieties are examples. Regarding this phenomenon\, I would like to talk about the following two results in this talk. First\, there are many projective varieties cut out ideal-theoretically by quadratic polynomials of rank 3. Second\, there is a nice structure of the locus of rank 3 quadratic equations of a projective variety.
URL:https://ccg.ibs.re.kr/event/2024-0625/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Algebraic Geometry Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20240626T160000
DTEND;TZID=Asia/Seoul:20240626T170000
DTSTAMP:20260416T110334
CREATED:20240527T024433Z
LAST-MODIFIED:20240613T013707Z
UID:3146-1719417600-1719421200@ccg.ibs.re.kr
SUMMARY:Jiewon Park\, Hessian Estimates\, Monotonicity Formulae\, and Applications
DESCRIPTION:    Speaker\n\n\nJiewon Park\nKAIST\n\n\n\n\n\n\nVarious monotonicity formulae have profound applications in many different problems in geometric analysis. Quite often these formulae can be derived from pointwise Hessian estimates\, also known as Li-Yau-Hamilton estimates or matrix Harnack inequalities. In this talk we will focus on this connection building upon Hessian estimates for the Green function\, leading to novel monotonicity formulae on manifolds with certain curvature lower bounds and Einstein manifolds. Some of the results have counterparts for Kähler manifolds.
URL:https://ccg.ibs.re.kr/event/2024-0626/
LOCATION:B236-1\, IBS\, Korea\, Republic of
CATEGORIES:Several Complex Variables Seminar
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