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SUMMARY:Youlin Li (Shanghai Jiao Tong University\, China)
DTSTART:20210129T120000Z
DTEND:20210129T124000Z
DTSTAMP:20260422T225925Z
UID:GTWorkshopTurkeyII/1
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/GTWorkshopTu
 rkeyII/1/">Symplectic fillings of lens spaces and Seifert fibered spaces</
 a>\nby Youlin Li (Shanghai Jiao Tong University\, China) as part of Geomet
 ry & Topology Workshop Turkey II\n\n\nAbstract\nWe apply Menke's JSJ decom
 position for symplectic fillings to several families of contact 3-manifold
 s. Among other results\, we complete the classification up to orientation-
 preserving diffeomorphism of strong symplectic fillings of lens spaces. Fo
 r large families of contact structures on Seifert fibered spaces over S^2\
 , we reduce the problem of classifying symplectic fillings to the same pro
 blem for universally tight or canonical contact structures. We show that f
 illings of contact manifolds obtained by surgery on certain Legendrian neg
 ative cables are the result of attaching a symplectic 2-handle to a fillin
 g of a lens space. This is joint work with Austin Christian.\n
LOCATION:https://researchseminars.org/talk/GTWorkshopTurkeyII/1/
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SUMMARY:Irena Matkovic (University of Oxford\, England)
DTSTART:20210129T130000Z
DTEND:20210129T134000Z
DTSTAMP:20260422T225925Z
UID:GTWorkshopTurkeyII/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/GTWorkshopTu
 rkeyII/2/">Non-loose negative torus knots</a>\nby Irena Matkovic (Universi
 ty of Oxford\, England) as part of Geometry & Topology Workshop Turkey II\
 n\n\nAbstract\nThe Legendrian invariant in knot Floer homology\, defined b
 y Lisca\, Ozsváth\, Stipsicz and Szabó\, is torsion for knots in overtwi
 sted structures\, and it is non-zero only if the knot is strongly non-loos
 e as a transverse knot. Using a correspondence between the knot invariants
  and invariants of contact surgeries\, I will show that strongly non-loose
  transverse realizations of negative torus knots are classified by their i
 nvariants and that their U-torsion order equals one.\n
LOCATION:https://researchseminars.org/talk/GTWorkshopTurkeyII/2/
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BEGIN:VEVENT
SUMMARY:Marc Kegel (Humboldt University Berlin\, Germany)
DTSTART:20210129T140000Z
DTEND:20210129T144000Z
DTSTAMP:20260422T225925Z
UID:GTWorkshopTurkeyII/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/GTWorkshopTu
 rkeyII/3/">Contact surgery numbers</a>\nby Marc Kegel (Humboldt University
  Berlin\, Germany) as part of Geometry & Topology Workshop Turkey II\n\n\n
 Abstract\nThe surgery number of a 3-manifold M is the minimal number of co
 mponents in a surgery description of M. Computing surgery numbers is in ge
 neral a difficult task and is only done in a few cases. In this talk\, I w
 ant to report on the same question for contact manifolds. In particular\, 
 we will study a method to compute contact surgery numbers for contact stru
 ctures on some Brieskorn spheres. This talk is based on joint work with Jo
 hn Etnyre and Sinem Onaran.\n
LOCATION:https://researchseminars.org/talk/GTWorkshopTurkeyII/3/
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