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X-WR-CALNAME:Institute of Mathematics and Informatics
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X-WR-CALDESC:Събития за Institute of Mathematics and Informatics
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DTSTART:20240331T010000
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DTSTART;TZID=Europe/Sofia:20240312T140000
DTEND;TZID=Europe/Sofia:20240312T153000
DTSTAMP:20260418T055718
CREATED:20240311T225834Z
LAST-MODIFIED:20240311T225834Z
UID:16009-1710252000-1710257400@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 12.03.2024 г.\, 14:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Morgan Brown  (University of Miami) \nДоклад: The Cox ring perspective on birational geometry \nДопълнителна информация: https://icms.bg/the-cox-ring-perspective-in-birational-geometry-talk-by-morgan-brown/ \nРезюме. The Mori program for birational classification of algebraic varieties attempts to classify algebraic varieties by producing canonical models\, polarized by the canonical class. This is accomplished through a series of algebraic surgery operations\, such as flips\, flops\, and divisorial contractions. A complementary viewpoint is that of the total coordinate ring or Cox ring. Here birational maps are understood by looking at the totality of all linear series on the variety\, endowed with a ring structure directly analogous to that of the homogeneous coordinate ring of a projective variety. I will give an overview of how Cox rings can help clarify many phenomena in birational geometry.
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bd%d0%b0-%d0%bc%d1%86%d0%bc%d0%bd-21/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240314T140000
DTEND;TZID=Europe/Sofia:20240314T153000
DTSTAMP:20260418T055718
CREATED:20240311T230335Z
LAST-MODIFIED:20240311T230335Z
UID:16014-1710424800-1710430200@math.bas.bg
SUMMARY:Семинар на МЦМН
DESCRIPTION:Дата: 14.03.2024 г.\, 14:00 ч. \nМясто: Зала 403\, ИМИ – БАН \nДокладчик: Morgan Brown  (University of Miami) \nДоклад: Cox rings and characterization of toric varieties \nДопълнителна информация: https://icms.bg/the-cox-ring-perspective-in-birational-geometry-talk-by-morgan-brown/ \nРезюме. Recently Moraga and Svaldi proved a conjecture of Shokoruv\, characterizing in the relative case toroidal morphisms as those which admit divisors with many components relative to the Picard rank. I will discuss the global version\, proved in previous joint work with McKernan\, Svaldi and Zong. The proof relies on characterizing the singularity type of the Cox ring\, giving another example of the use of these invariants in birational geometry.
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bd%d0%b0-%d0%bc%d1%86%d0%bc%d0%bd-22/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240320T160000
DTEND;TZID=Europe/Sofia:20240320T173000
DTSTAMP:20260418T055718
CREATED:20240315T080032Z
LAST-MODIFIED:20240315T080032Z
UID:16056-1710950400-1710955800@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН\nще се проведе в сряда\, 20 март 2024 г. от 16:00 ч. в зала 403: \nДоклад на тема \nEllipsoid superpotentials: obstructing symplectic embeddings by singular algebraic curves\n\nще изнесе Григори Михалкин\, Женевски университет. \n\n\nAbstract: How singular can be a local branch of a plane algebraic curve of a given degree d? A remarkable series of real algebraic curves was constructed by Stepan Orevkov. It is based on even-indexed numbers in the Fibonacci series: a degree 5 curve with a 13/2 cusp\, a degree 13 curve with a 34/5-cusp\, and so on. We discuss this and other series of algebraic curves in the context of the problem of symplectic packing of an ellipsoid into a ball\, with the answer given by the spectacular Fibonacci staircase of McDuff and Schlenk. The aspect ratio a>1 of the ellipsoid can be viewed as a real parameter for a certain enumerative superpotential function\, which is mostly locally constant\, but jumps at certain specific rational values (responsible for the aspects of cusp singularities). Based on joint work with Kyler Siegel.\n\nТова заседание на семинара няма да се излъчва в Zoom.
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bf%d0%be-%d0%b3%d0%b5%d0%be%d0%bc%d0%b5%d1%82%d1%80%d0%b8%d1%8f-%d0%bd%d0%b0-%d0%bc%d1%86%d0%bc%d0%bd-11/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%98%D0%BD%D1%81%D1%82%D0%B8%D1%82%D1%83%D1%82%20%D0%BF%D0%BE%20%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20%D0%B8%20%D0%B8%D0%BD%D1%84%D0%BE%D1%80%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20-%20%D0%91%D0%90%D0%9D":MAILTO:office@math.bas.bg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Sofia:20240327T160000
DTEND;TZID=Europe/Sofia:20240327T173000
DTSTAMP:20260418T055718
CREATED:20240326T081032Z
LAST-MODIFIED:20240326T081032Z
UID:16111-1711555200-1711560600@math.bas.bg
SUMMARY:Семинар по геометрия на МЦМН
DESCRIPTION:Следващата сбирка на Семинара по геометрия на МЦМН\nще се проведе в сряда\, 27 март 2024 г. от 16:00 ч. в зала 403: \nДоклад на тема \nReading seminar of geometric Lubin-Tate theory\n\nще изнесе Jiachang Xu\, ИМИ – БАН. \n\n\nAbstract: This is reading seminar of geometry of Lubin-Tate theory\, our goal is to understand the papers “M. J. Hopkins and B. H. Gross\, Equivariant vector bundles on the Lubin-Tate moduli space” and “Ramero\, Lorenzo On a class of étale analytic sheaves”. The first seminar we plan to go over the basis of deformation theory\, formal group and necessary rigid geometry.\n\nZoom link:\nhttps://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09
URL:https://math.bas.bg/event/%d1%81%d0%b5%d0%bc%d0%b8%d0%bd%d0%b0%d1%80-%d0%bf%d0%be-%d0%b3%d0%b5%d0%be%d0%bc%d0%b5%d1%82%d1%80%d0%b8%d1%8f-%d0%bd%d0%b0-%d0%bc%d1%86%d0%bc%d0%bd-12/
LOCATION:Институт по математика и информатика – БАН\, Block 8\, 1113 БАН IV км.\, София\, Bulgaria
CATEGORIES:Редовен семинар
ORGANIZER;CN="%D0%98%D0%BD%D1%81%D1%82%D0%B8%D1%82%D1%83%D1%82%20%D0%BF%D0%BE%20%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20%D0%B8%20%D0%B8%D0%BD%D1%84%D0%BE%D1%80%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0%20-%20%D0%91%D0%90%D0%9D":MAILTO:office@math.bas.bg
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