Seminar Algebra and Geometry - Fall 2018
Date | Speaker | Title | Abstract |
---|---|---|---|
September 18 11.00-11.30 |
(Basel) |
Vector/projective bundles over curves | Talk to present past and current work. |
September 18 11.30-12.00 |
(Basel) |
Birational Geometry of Algebraic Surfaces | Talk to present past and current work. |
September 25 10.30-11.00 |
(Basel) |
A_k-singularities of plane curves of fixed bidegree | Talk to present past and current work. |
September 25 11.00-11.30 |
(Basel) |
What transformation groups in algebraic, differential and metric geometry have in common? | Talk to present past and current work. |
September 25 11.30-12.00 |
(Basel) |
Algebraic Statistics: Gaussian Mixtures and Beyond | Talk to present past and current work. |
October 2 10.30-11.00 |
(Basel) |
Embeddings and tame automorphisms in affine geometry | Talk to present past and current work. |
October 2 11.00-11.30 |
(Basel) |
Cremona group and geometric group theory | Talk to present past and current work. |
October 2 11.30-12.00 |
(Basel) |
Birational geometry of surfaces and threefolds | Talk to present past and current work. |
October 9 | |||
October 10-11 |
(Conference in Dijon) |
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October 16 10.30-11.15 |
Talk to present past and current work. | ||
October 16 11.15-12.00 |
(Basel) |
Talk to present past and current work. | |
October 23 | (Jérémy away) | ||
October 30 | (conference in Loughbourough) |
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November 6 | (Rennes) |
Around a big mapping class group | The plane minus a Cantor set and its mapping class group appear in many dynamical contexts, including group actions on surfaces, the study of groups of homeomorphisms on a Cantor set, and complex dynamics. In this talk, I will motivate the study of this 'big mapping class groups'. I will then present the 'ray graph', which is a Gromov-hyperbolic graph on which this group acts by isometries. |
November 13 | (Bern) |
Positivity, Graphs and Unknotting | This talk will explore different notions of positivity of knots, how to encode such knots as graphs, and how to unknot them. Joint results with Baader/Liechti and Feller/Lobb will make appearances. No prerequisites in knot theory will be necessary. |
November 20 | (University of Georgia, Athens, US) |
Hyperkähler manifolds and their Betti numbers | Hyperkähler manifolds are higher-dimensional generalizations of K3 surfaces. The Beauville conjecture predicts that the number of deformation types of compact irreducible hyperkähler manifolds is finite in any dimension. In this talk I will briefly discuss some basic notions of the theory, explain why hyperkähler manifolds play a very important role in classification of complex manifolds, and then explain what are the evidences for Beauville's conjecture. |
November 26-30 |
(Conference in Rennes) |
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December 4 | (Grenoble) |
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December 11 | (Bern) |
tba | tba |
December 18 |