BEGIN:VCALENDAR VERSION:2.0 PRODID:-//University of Utah Math Department//Algebraic Geometry Seminar//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:Algebraic Geometry Seminar - Spring 1999 X-WR-CALDESC:Algebraic Geometry Seminar at University of Utah Mathematics Department X-WR-TIMEZONE:America/Denver BEGIN:VEVENT UID:19990120T153000-jian-kong@math.utah.edu DTSTART;TZID=America/Denver:19990120T153000 DTEND;TZID=America/Denver:19990120T163000 DTSTAMP:20260819T205508Z SUMMARY:Seshadri constants of Abelian varieties DESCRIPTION:Speaker: Jian Kong\, University of Utah\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990127T153000-aaron-bertram@math.utah.edu DTSTART;TZID=America/Denver:19990127T153000 DTEND;TZID=America/Denver:19990127T163000 DTSTAMP:20260819T205508Z SUMMARY:Counting rational curves with a torus of a different color DESCRIPTION:Speaker: Aaron Bertram\, University of Utah\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990203T153000-j%C3%A1nos-koll%C3%A1r@math.utah.edu DTSTART;TZID=America/Denver:19990203T153000 DTEND;TZID=America/Denver:19990203T163000 DTSTAMP:20260819T205508Z SUMMARY:Rationally connected varieties over local fields DESCRIPTION:Speaker: János Kollár\, University of Utah\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990210T153000-speaker@math.utah.edu DTSTART;TZID=America/Denver:19990210T153000 DTEND;TZID=America/Denver:19990210T163000 DTSTAMP:20260819T205508Z SUMMARY:No Seminar DESCRIPTION:Speaker: speaker\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990217T153000-christopher-hacon@math.utah.edu DTSTART;TZID=America/Denver:19990217T153000 DTEND;TZID=America/Denver:19990217T163000 DTSTAMP:20260819T205508Z SUMMARY:Remarks on Seshadri constants of vector bundles DESCRIPTION:Speaker: Christopher Hacon\, University of Utah\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990224T153000-speaker@math.utah.edu DTSTART;TZID=America/Denver:19990224T153000 DTEND;TZID=America/Denver:19990224T163000 DTSTAMP:20260819T205508Z SUMMARY:No Seminar DESCRIPTION:Speaker: speaker\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990303T153000-sorin-popescu@math.utah.edu DTSTART;TZID=America/Denver:19990303T153000 DTEND;TZID=America/Denver:19990303T163000 DTSTAMP:20260819T205508Z SUMMARY:Syzygies of subcanonical subschemes. Abstract: I will describe joint work with D. Eisenbud and Ch. Walter on resolutions by vector bundles. The idea is that coherent sheaves on projective space which are symmetric in a suitable sense have symmetric vector bundle resolutions. This generalizes results on surfaces with even sets of nodes, theta characteristics of plane curves, self-linked space curves, and recent results of Catanese, Kleiman-Lipman-Ulrich, Walter and others. I will also describe a structure result for Gorenstein subcanonical projective subschemes of codimension 3, and construct examples of smooth codimension 3 subcanonical varieties which are not Pfaffian (a projective subscheme of codimension 3 is Pfaffian if it is the degeneracy locus of a skew-symmetric morphism f : E^* --> E(t) with E a vector bundle of odd rank.) DESCRIPTION:Speaker: Sorin Popescu\, Columbia and MSRI\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990305T153000-yuri-tschinkel@math.utah.edu DTSTART;TZID=America/Denver:19990305T153000 DTEND;TZID=America/Denver:19990305T163000 DTSTAMP:20260819T205508Z SUMMARY:Points on rational varieties. Abstract: We study the distribution of rational points of bounded height on varieties closely related to linear algrebraic groups. DESCRIPTION:Speaker: Yuri Tschinkel\, University of Illinois at Chicago\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990310T153000-mohan-ramachandran@math.utah.edu DTSTART;TZID=America/Denver:19990310T153000 DTEND;TZID=America/Denver:19990310T163000 DTSTAMP:20260819T205508Z SUMMARY:On Complex hyperbolic manifolds and their structure at infinity DESCRIPTION:Speaker: Mohan Ramachandran\, SUNY Buffalo\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990317T153000-speaker@math.utah.edu DTSTART;TZID=America/Denver:19990317T153000 DTEND;TZID=America/Denver:19990317T163000 DTSTAMP:20260819T205508Z SUMMARY:No Seminar DESCRIPTION:Speaker: speaker\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990324T153000-wiesia-niziol@math.utah.edu DTSTART;TZID=America/Denver:19990324T153000 DTEND;TZID=America/Denver:19990324T163000 DTSTAMP:20260819T205508Z SUMMARY:Semi-stable conjecture for vertical log-smooth fibrations DESCRIPTION:Speaker: Wiesia Niziol\, Utah\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990329T153000-adrian-vasiu@math.utah.edu DTSTART;TZID=America/Denver:19990329T153000 DTEND;TZID=America/Denver:19990329T163000 DTSTAMP:20260819T205508Z SUMMARY:Shimura varieties and the Mumford-Tate conjecture DESCRIPTION:Speaker: Adrian Vasiu\, UC Berkeley\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990331T153000-boris-dubrovin@math.utah.edu DTSTART;TZID=America/Denver:19990331T153000 DTEND;TZID=America/Denver:19990331T163000 DTSTAMP:20260819T205508Z SUMMARY:Elliptic Gromov-Witten invariants and tau-functions DESCRIPTION:Speaker: Boris Dubrovin\, SISSA and MSRI\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990407T153000-ravi-vakil@math.utah.edu DTSTART;TZID=America/Denver:19990407T153000 DTEND;TZID=America/Denver:19990407T163000 DTSTAMP:20260819T205508Z SUMMARY:Twelve points on the projective line. Abstract: There are many ways to geometrically define a (PGL(2)-invariant) divisor in the variety of "12 points in P^1", Sym^{12}(P^1), isomorphic to P^{12}. For example: the 12 nodal cubics in a pencil of plane cubics; the branch points of a degree 4 map of a genus 3 hyperelliptic curve to P^1; the branch points of a genus 3 curve mapped to P^1 by the canonical sheaf; the branch points of a genus 4 curve mapped to P^1 by a theta-characteristic. We'll see that these divisors (and others) are all the same, by showing that the corresponding moduli spaces are covers of others. The links involve various beautiful classical constructions. DESCRIPTION:Speaker: Ravi Vakil\, M.I.T.\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990414T153000-bill-lang@math.utah.edu DTSTART;TZID=America/Denver:19990414T153000 DTEND;TZID=America/Denver:19990414T163000 DTSTAMP:20260819T205508Z SUMMARY:Pathologies of algebraic surfaces in characteristic p DESCRIPTION:Speaker: Bill Lang\, Brigham Young University\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990421T153000-alexander-buium@math.utah.edu DTSTART;TZID=America/Denver:19990421T153000 DTEND;TZID=America/Denver:19990421T163000 DTSTAMP:20260819T205508Z SUMMARY:Arithmetic jet spaces DESCRIPTION:Speaker: Alexander Buium\, University of Illinois at Urbana/Champaign\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990425T153000-speaker@math.utah.edu DTSTART;TZID=America/Denver:19990425T153000 DTEND;TZID=America/Denver:19990425T163000 DTSTAMP:20260819T205508Z SUMMARY:WAGS DESCRIPTION:Speaker: speaker\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT BEGIN:VEVENT UID:19990428T153000-rick-miranda@math.utah.edu DTSTART;TZID=America/Denver:19990428T153000 DTEND;TZID=America/Denver:19990428T163000 DTSTAMP:20260819T205508Z SUMMARY:Linear Systems of Plane Curves with Prescribed Multiplicities: New Approaches to the Harbourne-Hirschowitz Conjecture DESCRIPTION:Speaker: Rick Miranda\, Colorado State University\n\n LOCATION:JFB 102 URL:http://math.utah.edu/agseminar/1999-spring/ END:VEVENT END:VCALENDAR