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Western Mathematics Calendar

October 2024

Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
		1 Transformation Groups Seminar 09:30 Tao Gong (Western) On contractibility of quotients of real toric varieties from Weyl groups II Transformation Groups Seminar Speaker: Tao Gong (Western) "On contractibility of quotients of real toric varieties from Weyl groups II" Time: 09:30 - 11:00 Room: MC 108 Given a reduced crystallographic root system with a fixed simple system, it is associated to a Weyl group $W$ and a polytope $P$ which is the convex hull of the $W$-orbit of a dominant weight. The polytope $P$ is associated to a real toric varieties $X_P^{\mathbb{R}}$. We will see that the underlying topological space $X_P^{\mathbb{R}}/W$ is contractible when the rank is below 7. This is the second part of this talk.	2 Geometry and Topology 15:30 Georg Wille (Philipps-UniversitÃ¤t Marburg) Classifying spaces in discrete homotopy theory Geometry and Topology Speaker: Georg Wille (Philipps-UniversitÃ¤t Marburg) "Classifying spaces in discrete homotopy theory" Time: 15:30 - 16:30 Room: MC 107	3	4	5
6	7 Geometry and Combinatorics 15:30 Graham Denham (Western) matroids and toric varieties I Geometry and Combinatorics Speaker: Graham Denham (Western) "matroids and toric varieties I" Time: 15:30 - 16:30 Room: MC 108 I will give the first of two(?) expository talks on how toric and tropical geometry can be useful to study matroids.	8	9 Geometry and Topology 15:30 Matthias Franz (Western) The homology of fibre bundles Geometry and Topology Speaker: Matthias Franz (Western) "The homology of fibre bundles" Time: 15:30 - 16:30 Room: MC 107 We review several known, but unfortunately not well-known results about the (singular) homology of fibre bundles. We use simplicial sets and in particular twisted Cartesian products, which are the simplicial analogues of fibre bundles. The central result is the twisted Eilenberg-Zilber theorem, which relates the chains on a bundle to a twisted tensor product of the chains on base and fibre. The Eilenberg-Moore theorems are easy consequences of it.	10	11	12
13	14	15	16	17	18	19
20	21	22	23 Geometry and Topology 15:30 Tao Gong (Western) TBA Geometry and Topology Speaker: Tao Gong (Western) "TBA" Time: 15:30 - 16:30 Room: MC 107	24 Colloquium 15:30 Kelvin Chan (Western) TBA Colloquium Speaker: Kelvin Chan (Western) "TBA" Time: 15:30 - 16:30 Room: MC 108	25	26
27	28	29	30 Geometry and Topology 15:30 Nathan Kershaw (Western) TBA Geometry and Topology Speaker: Nathan Kershaw (Western) "TBA" Time: 15:30 - 16:30 Room: MC 107	31

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