Geometry Seminar of ICMS

The next session of the Geometry Seminar of ICMS will be held on Wednesday, February 28, 2024, at 16:00, in room 403 and via Zoom. A talk on: Linear embeddings of complex Grassmannians will be delivered by Ivan Penkov, Constructor University Bremen. Zoom link: https://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09 Abstract: A linear embedding of Grassmannians, one of which could possibly be isotropic, is an embedding which respects the generators of Picard groups. Several years ago A.S. Tikhomirov and I classified such embeddings when both Grassmannians are simultaneously usual Grassmannians or isotropic Grassmannians of the same type(orthogonal or symplectic). In this talk I will discuss also the mixed case. A classification as above has an application to the classification of infinite-dimensional linear ind-Grassmannians, and I shall  briefly explain this [...]

2024-02-22T11:19:16+02:00Thursday, 22 February 2024|Categories: |Tags: , |

Geometry Seminar of ICMS

The next session of the Geometry Seminar of ICMS will be held on Wednesday, February 7, 2024, at 16:00, in room 403 and via Zoom. A talk on: Refined curve counting will be delivered by Mikhail Shkolnikov, IMI-BAS. Zoom link: https://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09 Abstract: Refining an enumerative problem upgrades the numerical solution to a polynomial so that its specialization gives the original number. A prototypical example of such refinement arises in the tropical curve counting from replacing Mikhalkin multiplicities, corresponding to counting complex curves, with Block-Goettsche multiplicities. I will speak about the invariance of this count and its various interpretations.

2024-02-12T15:39:25+02:00Monday, 12 February 2024|Categories: |Tags: , |

Geometry Seminar of ICMS

The next session of the Geometry Seminar of ICMS will be held on Wednesday, February 7, 2024, at 16:00, in room 403 and via Zoom. A talk on: Introduction to curve counting will be delivered by Mikhail Shkolnikov, IMI-BAS. Zoom link: https://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09 Abstract: This talk is intended as a very gentle introduction to the classical subject of enumerative geometry concerned with problems of counting algebraic curves with prescribed properties. In the realm of classical planimetry, we know that there exists a single circle passing through a collection of three points, provided that these points are generic. Here “generic” simply means that the points are not collinear, i.e. don’t belong to the same line but could refer to some other open condition in a different [...]

2024-02-05T23:20:38+02:00Monday, 5 February 2024|Categories: |Tags: , |

Geometry Seminar of ICMS

The next session of the Geometry Seminar of ICMS will be held on Wednesday, January 24, 2024, at 16:00, in room 403 and via Zoom. A talk on: Derived Deformation Theory and Formal Moduli Problem will be delivered by Yingdi Qin, IMI-BAS. Zoom link: https://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09 Abstract: Derived deformation theory studies the formal neighborhoods of moduli spaces. The classical work of Kodaira-Spencer on deformation of complex manifolds tells that the dg Lie algebra A^(0,*)(X,TX) controls the deformations of the complex manifold. The example illustrates the following general principle: A dg Lie algebra gives rise to a deformation functor by considering the  Maurer-Cartan elements of the dg Lie algebra tensoring with the maximal ideal of an Artin local ring. This idea is explored by many people, including  Quillen, [...]

2024-01-31T17:05:15+02:00Tuesday, 30 January 2024|Categories: |Tags: , |

Geometry Seminar of ICMS

The next session of the Geometry Seminar of ICMSwill be held on Wednesday, January 24, 2024, at 16:00, in room 403 and via Zoom.A talk on:Introduction to Derived Algebraic Geometry and deformation theorywill be delivered by Yingdi Qin, IMI-BAS.Zoom link:https://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09

2024-01-22T14:29:06+02:00Monday, 22 January 2024|Categories: |Tags: , |

ICMS Geometry Seminar

The next session of the Geometry Seminar of ICMS will be held on Wednesday, December 6th, at 16:00, in room 403 and via Zoom. A talk on: Valuations of Higher Rank will be delivered by Andrei Benguş-Lasnier – International Center for Mathematical Sciences (ICMS – Sofia). Zoom link: https://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09  

2023-12-07T23:25:33+02:00Thursday, 7 December 2023|Categories: |Tags: , |

ICMS Geometry Seminar

The next session of the Geometry Seminar of ICMS will be held on Wednesday, December 6th, at 16:00, in room 403 and via Zoom. A talk on: Introduction to tropical modifications (II) will be delivered by Nikita Kalinin – International Center for Mathematical Sciences (ICMS – Sofia). Zoom link: https://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09  

2023-12-04T12:38:12+02:00Thursday, 30 November 2023|Categories: |Tags: , |

ICMS Geometry Seminar

The next session of the Geometry Seminar of ICMS will be held on Wednesday, November 15th, at 16:00, in room 403 and via Zoom: Topics in non-archimedean analytic geometry (I), by Jiachang Xu – International Center for Mathematical Sciences (ICMS – Sofia) Zoom link: https://us02web.zoom.us/j/83740034721?pwd=VnBtcVpGUktscHQ4a09jZkNZTURyZz09

2023-11-10T18:56:07+02:00Friday, 10 November 2023|Categories: |Tags: , |
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