SeminarsInterwoven LiveSite
https://www.southampton.ac.uk/maths/news/seminars/latest.pageMathematical Sciences seminarsSTAG Public Lecture 2018 - Probing the Universe with Gravitational Waves, Rainer Weiss (Physics Nobel Laureate)https://cdn.southampton.ac.uk/assets/imported/transforms/site/seminar/PageThumbnail/ADB4A6BBBD6C4BF3818BA11395C6B30F/STAG 2018.JPG_SIA_JPG_fit_to_width_XL.jpghttps://www.southampton.ac.uk/maths/news/seminars/2018/10/03-stag-weiss-seminar.pageWed, 03 Oct 2018 00:00:00 +0100
[14:30 - 15:30, 3 October 2018]
The observations of gravitational waves opens a new way to learn about the universe as well as to test General Relativity in the limit of strong gravitational interactions – the dynamics of massive bodies traveling at relativistic
speeds in a highly curved space-time. The lecture will describe some of the difficult history of gravitational waves proposed about 100 years ago. The concepts used in the instruments and the methods for data analysis that enable
the measurement of gravitational wave strains of 10-21 and smaller will be presented. The results derived from the measurement, their relation to the Einstein equations and the astrophysical implications will also be discussed. The
talk will end with a vision for the future of gravitational wave astronomy.CORMSIS Seminar - The Maximum Clique Interdiction Game, Dr Fabio Furini (Paris-Dauphine)https://cdn.southampton.ac.uk/assets/imported/transforms/site/seminar/PageThumbnail/19EC7D4B7D604E969F2E0509933195FA/OR 1.JPG_SIA_JPG_fit_to_width_XL.jpghttps://www.southampton.ac.uk/maths/news/seminars/2018/08/16-cormsis-furini-seminar.pageThu, 16 Aug 2018 00:00:00 +0100
[14:00 - 15:00, 16 August 2018]
We study the two player zero-sum Stackelberg game in which the leader interdicts (removes) a limited number of vertices from the graph, and the follower searches for the maximum clique in the interdicted graph. The goal of the leader is to derive an interdiction policy which will result in the worst possible outcome for the follower. This problem has applications in many areas, such as crime detection, prevention of outbreaks of infectious diseases and surveillance of communication networks. We design an exact solution framework based on a Bilevel Integer Linear Programming model. Thanks to the study of the polytope of the corresponding single-level reformulation, we derive a branch-and-cut algorithm and enhance it by tight combinatorial lower and upper bounds, which also allow for a drastic reduction of the size of the input graph. Our model is based on an exponential family of Clique-Interdiction Cuts whose separation requires solving the maximum clique problem. We derive an effective separation procedure based on a newly developed combinatorial algorithm that is tailored for finding maximum cliques in interdicted graphs. We assess the applicability and the limits
of our exact framework on publicly available instances, including large-scale social networks with up to one hundred thousand vertices and three million edges. Most of these instances are solved to provable optimality within short computing times. Our code (which will be also publicly available) allows to analyze the resilience of (social) networks with respect to vertex-interdiction attacks, i.e., the decrease of the size of the maximum clique in function of incremental interdiction budget level.S3RI Seminar - Hanlin Shang (Australian National University)https://cdn.southampton.ac.uk/assets/imported/transforms/site/seminar/PageThumbnail/628F48F010A8491880342DA31BA13D3C/S3RI.JPG_SIA_JPG_fit_to_width_XL.jpghttps://www.southampton.ac.uk/maths/news/seminars/2018/07/12-s3ri-shang-seminar.pageThu, 12 Jul 2018 00:00:00 +0100
[15:00 - 16:00, 12 July 2018]
An interesting seminar, be sure not to miss it!String Theory Seminar - Dr Sanjaye Ramgoolam (QMUL)https://cdn.southampton.ac.uk/assets/imported/transforms/site/seminar/PageThumbnail/050BEB09997B434FADC4B28C29ED71D5/String theory 1.JPG_SIA_JPG_fit_to_width_XL.jpghttps://www.southampton.ac.uk/maths/news/seminars/2018/07/04-string-theory-ramgoolam-seminar.pageWed, 04 Jul 2018 00:00:00 +0100
[15:00 - 16:00, 4 July 2018]
An interesting seminar, be sure not to miss it!Pure PGR Seminar - A Conjecture on Splitting of Groups, Ana Lopes (Southampton)https://cdn.southampton.ac.uk/assets/imported/transforms/site/seminar/PageThumbnail/96A9858828AC4AC793B27F5331BE968F/PG Pure.JPG_SIA_JPG_fit_to_width_XL.jpghttps://www.southampton.ac.uk/maths/news/seminars/2018/07/05-pgr-lopes-seminar.pageWed, 04 Jul 2018 00:00:00 +0100
[15:00 - 16:00, 4 July 2018]
In this talk I will explain what a splitting of group means and I will show a conjecture given by Professor Peter Kropholler on the matter. My research is a proof of a particular case of such conjecture, involving a concept (to be introduced) called ‘Relative Ends’. I aim to give a seminar on a first year PhD student level. There might be some playing around with sets. Perhaps a lot of it. Maybe it is a lecture on sets, not purely on group theory. Who knows!
Pure Maths Seminar - Finiteness conditions for profinite groups with positive probability, Dr Ged Corob-Cook (University of the Basque Country, Bilbao, Spain)https://cdn.southampton.ac.uk/assets/imported/transforms/site/seminar/PageThumbnail/3B8FD10817A940DEAD581D8C26978DDE/Pure.JPG_SIA_JPG_fit_to_width_XL.jpghttps://www.southampton.ac.uk/maths/news/seminars/2018/06/20-corob-cook-seminar.pageWed, 20 Jun 2018 00:00:00 +0100
[15:00 - 17:00, 20 June 2018]
A profinite group G is called positively finitely generated if, for some n, it is generated by n random elements with positive probability. This gives information about the generation of the finite quotients of G. Similarly to the usual condition of being finitely generated, we can define and study higher analogues like being positively finitely presented and positively of type FP_n. I will talk about my work on these higher conditions, what we know so far, and some open questions in this area.CORMSIS Seminar - Joint meeting of the Southern OR Group, the OR Society Simulation SIG and CORMSIShttps://cdn.southampton.ac.uk/assets/imported/transforms/site/seminar/PageThumbnail/19EC7D4B7D604E969F2E0509933195FA/OR 1.JPG_SIA_JPG_fit_to_width_XL.jpghttps://www.southampton.ac.uk/maths/news/seminars/2018/06/18-cormsis-joint-meeting.pageMon, 18 Jun 2018 00:00:00 +0100
[16:00 - 18:30, 18 June 2018]
There will be two talks: "The Art and Science of Modelling" by Paul Fishwick (UT Dallas) and "Investigating the use of real-time data in nudging patients' emergency department attendance behaviour using the NHSquicker Platform" by Navonil Mustafee and John Powell (University of Exeter). Abstracts follow: "The Art and Science of Modelling" One of the characteristics of being human is to model. In our history, we began with representations of animals made from natural materials, and painted on cave walls. We also made regular marks on animal bones. While the modern accounting of these products is art (animal representations) and mathematics (bone marks), a more comprehensive understanding points to modelling in both cases. We saw or imagined things, and then we made models of our experience. This talk will be a non-technical, cross-disciplinary, introduction to modelling. I will discuss (1) the history of modelling, (2) a way of thinking about modelling using three broad categories, (3) the notion that computer and information science is a form of modelling, and (4) approaches to modelling across disciplines – from art and humanities to business, science, and engineering. "Investigating the use of real-time data in nudging patients' emergency department attendance behaviour using the NHSquicker Platform" Decision-making in healthcare is a complex process involving multiple stakeholders. One such stakeholder category is the intended users of the system itself – the patients. We present a study in which users use real-time hospital operations data to make attendance choices. The aim of this research is to provide information transparency on Emergency Department /Minor Injury Unit (ED/MIU) waiting times which would allow recipients, including, significantly, patients who are in need of urgent medical attention, to make informed decisions as to the facility that could best serve their needs. This work is expected to contribute towards reducing pressure in ED by redistributing demand for minor ailments among the MIUs, since the MIUs have facilities for the treatment of minor injuries and the ED exists mainly for emergency and life-threating conditions.S3RI Seminar - Professor Emeritus, Chihiro Hirotsu (Meisei University)https://cdn.southampton.ac.uk/assets/imported/transforms/site/seminar/PageThumbnail/2A6752D1A5744C319357312BB73E0D32/S3ri logo.JPG_SIA_JPG_fit_to_width_XL.jpghttps://www.southampton.ac.uk/s3ri/news/seminars/2018/06/14-s3ri-hirotsu-seminar.pageThu, 14 Jun 2018 00:00:00 +0100
[14:00 - 15:00, 14 June 2018]
The shape hypothesis (such as monotone) is essential in dose-response analysis where a rigid parametric model is usually difficult to assume. Then isotonic regression is the most well known approach. It has been, however, introduced rather intuitively and has no obvious optimality. Further the restricted maximum likelihood approach is computationally too complicated to extend to non-normal distributions, to other shape constraints and to two-way data. Instead our approach starts from a complete class lemma for the tests against a general restricted alternative. It suggests the use of the singly-, doubly- and triply-accumulated statistics for the monotone, convexity and sigmoidicity hypotheses, respectively. It should be stressed here that there is a close relationship between the shape and change-point hypotheses, which leads to a unifying approach to those two different topics in statistics. We propose the maximal contrast type statistics based on the accumulated statistics. The basic statistics are so simple and we have a very nice Markov property for an elegant and exact probability calculation not only for the normal distribution but also for the Poisson and multinomial distributions.Maths & Mingle Seminarhttps://cdn.southampton.ac.uk/assets/imported/transforms/site/seminar/PageThumbnail/9511FCDF00B0435BA53B1EB6687D7A4D/Maths_Mingle_logo.png_SIA_JPG_fit_to_width_XL.jpghttps://www.southampton.ac.uk/maths/news/seminars/2018/06/13-maths-and-mingle.pageWed, 13 Jun 2018 00:00:00 +0100
[11:15 - 13:30, 13 June 2018]
Maths & Mingle is a monthly lunchtime seminar for postgraduate research students to meet researchers from other research groups, to broaden their knowledge and awareness of research being undertaken in the wider Mathematical Sciences community, and to form a network for students to give and receive support and advice on all aspects of PGR life.Pure Maths Colloquium - Prof Eric Swenson (Brigham Young University, Utah)https://cdn.southampton.ac.uk/assets/imported/transforms/site/seminar/PageThumbnail/131857DE045A4EF48D239D39F5C0F651/pure-colloq-img.png_SIA_JPG_fit_to_width_XL.jpghttps://www.southampton.ac.uk/maths/news/seminars/2018/06/08-pure-colloq-swenson.pageFri, 08 Jun 2018 00:00:00 +0100
[15:30 - 16:30, 8 June 2018]
A very nice talk!