Seminars this week

20191211T140000 20191211T145000 Pure Maths Colloquium (Anitha Thillaisundaram ) Speaker: Anitha Thillaisundaram (University of Lincoln)\n Home page: https://staff.lincoln.ac.uk/92794aa4-1fd2-4ea3-ae3f-c3867aa5e9da\n Title: Ramification structures for quotients of generalised Grigorchuk-Gupta-Sidki groups \n URL: /maths/sem_week.html?id=3293\n

Pure Maths Colloquium

Anitha Thillaisundaram (University of Lincoln)

Ramification structures for quotients of generalised Grigorchuk-Gupta-Sidki groups

Wednesday, 11 December at 14:00
J11

Abstract

Groups of surfaces isogenous to a higher product of curves can be characterised by a purely group-theoretic condition, which is the existence of a so-called ramification structure. Gul and Uria-Albizuri showed that quotients of the periodic Grigorchuk-Gupta-Sidki groups, GGS-groups for short, admit ramification structures. We extend their result by showing that quotients of generalisations of the GGS-groups also admit ramification structures, with some deviations for the case p=2. This is joint work with Elena Di Domenico and Sukran Gul.

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20191211T150000 20191211T155000 Algebra / Algebraic Geometry seminar (Adeel Khan) Speaker: Adeel Khan (University of Regensburg)\n Home page: https://www.preschema.com\n Title: Intersection theory of derived stacks \n URL: /maths/sem_week.html?id=3396\n

Algebra / Algebraic Geometry seminar

Adeel Khan (University of Regensburg)

Intersection theory of derived stacks

Wednesday, 11 December at 15:00
LT-B

Abstract

I will discuss how various formalisms of intersection theory (Chow groups, K-theory, cobordism) can be extended to the setting of derived schemes and stacks. This gives a new approach to virtual phenomena such as the virtual fundamental class and virtual Riemann-Roch formulas.

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20191211T150000 20191211T155000 Cosmology, Relativity and Gravitation (Theo Torres) Speaker: Theo Torres (University of Sheffield)\n Home page: https://www.researchgate.net/scientific-contributions/2119517191_Theo_Torres\n Title: Hydrodynamic simulations of rotating black holes \n URL: /maths/sem_week.html?id=3328\n

Cosmology, Relativity and Gravitation

Theo Torres (University of Sheffield)

Hydrodynamic simulations of rotating black holes

Wednesday, 11 December at 15:00
J11, Hicks

Abstract

Wave scattering phenomena are ubiquitous in almost all Sciences, from Biology to Physics. Interestingly, it has been shown many times that different physical systems are the stage to the same processes. One stunning example is the observation that waves propagating on a flowing fluid effectively experience the presence of a curved space-time. In this talk we will use this analogy to investigate, both theoretically and experimentally, fundamental effects occurring around vortex flows and rotating black holes. In particular, we will focus on light-bending, superradiance scattering, and quasi-normal modes emission

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20191211T160000 20191211T165000 ShEAF: postgraduate pure maths seminar (Callum Reader) Speaker: Callum Reader\n Title: TBA \n URL: /maths/sem_week.html?id=3365\n

ShEAF: postgraduate pure maths seminar

Callum Reader

TBA

Wednesday, 11 December at 16:00
J11 Hicks

Abstract

TBA

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20191212T130000 20191212T135000 Teaching Lunch (James Cranch) Speaker: James Cranch (Sheffield)\n Home page: http://cranch.staff.shef.ac.uk/\n Title: Maths competitions, and the journey from school to university \n URL: /maths/sem_week.html?id=3395\n

Teaching Lunch

James Cranch (Sheffield)

Maths competitions, and the journey from school to university

Thursday, 12 December at 13:00
LT6

Abstract

This summer, when I wasn't working in SoMaS as normal, I helped run the 60th International Mathematical Olympiad in Bath, and handed in a dissertation for a Masters degree in education. I'd like to talk about what these activities might have to do with one another: I'll speculate a bit about what universities can and should be doing to help school-aged students with their maths.

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20191212T140000 20191212T145000 Statistics Seminar (Jeremy Colman) Speaker: Jeremy Colman (Sheffield)\n Title: Simulation-Based Calibration (SBC) \n URL: /maths/sem_week.html?id=3336\n

Statistics Seminar

Jeremy Colman (Sheffield)

Simulation-Based Calibration (SBC)

Thursday, 12 December at 14:00
LT E

Abstract

SBC is a relatively new method for checking Bayesian inference algorithms. Its advocates (Talts et al. (2017)) argue that it identifies inaccurate computation and inconsistencies in model implementation and also provides graphical summaries to indicate the nature of the underlying problems. An example of such a summary is given. Although SBC has emerged from the Stan development team it is applicable to any Bayesian model that is capable of generating posterior samples. It does not require the use of any particular modelling language. I shall explain why there might indeed be a gap that SBC could fill, demonstrate how SBC works in practice, and discuss the balance between its costs and benefits.

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20191212T160000 20191212T165000 Topology seminar (Gong Show) Speaker: Gong Show\n Title: \n URL: /maths/sem_week.html?id=3289\n

Topology seminar

Gong Show

Thursday, 12 December at 16:00
J11
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20191216T140000 20191216T145000 Mathematical Biology Seminar Series (Thomas Clay) Speaker: Thomas Clay (Liverpool)\n Title: \n URL: /maths/sem_week.html?id=3346\n

Mathematical Biology Seminar Series

Thomas Clay (Liverpool)

Monday, 16 December at 14:00
Hicks LT9
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20191216T150000 20191216T155000 Algebraic Geometry Learning Seminar Speaker: \n Title: K3 surfaces, 12 \n URL: /maths/sem_week.html?id=3320\n

Algebraic Geometry Learning Seminar

K3 surfaces, 12

Monday, 16 December at 15:00
J11
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20191218T140000 20191218T145000 Algebra / Algebraic Geometry seminar (Alexandr Buryak) Speaker: Alexandr Buryak (Leeds)\n Home page: https://sites.google.com/site/alexandrburyakhomepage/home\n Title: \n URL: /maths/sem_week.html?id=3271\n

Algebra / Algebraic Geometry seminar

Alexandr Buryak (Leeds)

Wednesday, 18 December at 14:00
J11
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