Meetings Archive

Probability, Analysis and Dynamics conference 2021

Date: 7-9 April 2021

University of Bristol

Organisers: Marton Balázs, Edward Crane, Asma Hassannezhad, Kevin Hughes, Thomas Jordan, John Mackay, Bálint Tóth

Invited speakers:

David Aldous (Berkeley)
Keith Ball (Warwick)
Michiel van den Berg (Bristol)
Anthony Carbery (Edinburgh)
Anna Erschler (ENS Paris)
Charles Fefferman* (Princeton)
Alessio Figalli (ETH Zürich)
Maarit Järvenpää (Oulu)
Wilfrid Kendall (Warwick)
Thomas Kurtz (Madison-Wi)
Carlangelo Liverani (Roma Tor Vergata)
Gaven Martin (Massey, New Zealand)
Boris Solomyak (Bar-Ilan)
Gwyneth Stallard (Open University)
Karl-Theodor Sturm (Bonn)
Monica Visan (UCLA)
Benjamin Weiss (Jerusalem)

* To be confirmed

For more information, please visit the conference website.

Registration will open closer to the time.

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Graeme Worster- Colloquium

Monday 9th March, 4:00-5:00pm, The Fry Building, LG.02

Fluid dynamics of marine ice sheets

Abstract: Marine ice sheets flow on bedrock that is below sea level and terminate in floating ice shelves.  Fluid dynamics controls the location of the grounding line, where the ice sheet detaches from the bed rock and starts to float, which in turn determines the rate at which grounded ice is transported into the ocean and contributes to sea-level rise.  I will describe some simple laboratory experiments and associated mathematical models that capture the dynamics of marine ice sheets, highlighting the role of the floating shelves in buttressing the grounded ice sheet.  I will also describe a novel fluid-mechanical instability of shear-thinning, radially extensional flows that may describe certain longitudinal fractures in ice shelves. 

If you would like to attend this talk, please register by filling in this short registration form.

As always there will be a wine reception afterwards in the Staff Common room.

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Elmer Rees Memorial Meeting

The Fry Building, LG.22

We are holding a one-day conference in Elmer’s memory and to mark his contribution to UK Mathematics.

There will be a series of speakers throughout the day, both mathematical and personal. Please find the programme for the meeting here.

If you would like to attend this event, please register for your place here.

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Fifth Workshop on Generalised Baire Spaces

The workshop will begin on Monday at 9am and end on Tuesday at 4pm. It is open to everyone.

For more information, please see the conference website.

Description Generalized descriptive set theory studies spaces of functions on uncountable regular cardinals and properties of their definable subsets. This is a relatively new and very active field of set theoretic research. The talks will focus on generalized descriptive set theory and its connections with model theory and infinite combinatorics. There will be two tutorials on connections with model theory.

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Eric Moulines mini-series of lectures

Eric Moulines will be visiting the Heilbronn Institute of Mathematical Research as a Data Science Visitor from 27th January- 31st January. During his stay Eric will be delivering a series of lectures on Convex optimization for machine learning.

Tuesday 28th January 11:00- 12:00 G.09, The Fry Building
Thursday 30th January 13:00- 14:00, G.10, The Fry Building
Friday 31st January 10:00- 11:00, G.09, The Fry Building

Title: Convex optimization for machine learning

Abstract: The purpose of this course is to give an introduction to convex optimization and its applications in statistical learning.

In the first part of the course, I will recall the importance of convex optimisation in statistical learning. I will briefly introduce some useful results of convex analysis. I will then analyse gradient descent algorithms for strongly convex and then convex smooth functions. I will take this opportunity to establish some results on complexity lower bounds for such problems. I will show that the gradient descent algorithm is suboptimal and does not reach the optimal possible speed of convergence. I will the present a strategy to accelerate gradient descent algorithms in order to obtain optimal speeds.

In the second part of the course, I will focus on non smooth optimisation problems. I we will introduce the proximal operator of which I will establish some essential properties. I will then study the proximal gradient algorithms and their accelerated versions.

In a third part, I will look at stochastic versions of these algorithms.

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Heilbronn Colloquium – Leader

26th February 2020

University of Bristol

We are delighted to welcome Imre Leader to the University of Bristol to deliver a Heilbronn Colloquium.

Title: Partition Regular Equations

Abstract:  A finite or infinite matrix M is called ‘partition regular’ if whenever
the natural numbers are finitely coloured there exists a monochromatic
vector x with Mx=0. Many of the classical results of Ramsey theory, such
as van der Waerden’s theorem or Schur’s theorem, may be naturally rephrased
as assertions that certain matrices are partition regular.

While the structure of finite partition regular matrices is well understood,
little is known in the infinite case. In this talk we will review some known
results and then proceed to some recent developments.

The talk will not assume any previous knowledge of the area.

The colloquium will take place in Lecture theatre 2.41, Fry Building at 16:00-17:00 followed by a wine reception in the Fry Common room.

If you would like to attend the talk, please register by filling in this short registration form.

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Heilbronn Colloquium – Carlsson

13th March 2020

University of Bristol

We are delighted to welcome Gunnar Carlsson to the University of Bristol to deliver a Heilbronn Colloquium.

Gunnar Carlsson is an exceptionally distinguished algebraic topologist.  He has worked at UCSD (1978-1986), Princeton (1986-1991) and Stanford (1991-present).  Professor Carlsson has made a number of important contributions, including, for example, his proof of Segal’s Burnside Conjecture and his proof of Sullivan’s fixed point conjecture.  He is also renowned for his work in Topological Data Analysis and Machine Learning, including founding the predictive technology company Ayasdi.

Title: Topology for Machine Learning

Abstract: In recent years, methods of topology have been adapted to the study of large and complex data sets. Topology can provide many useful summaries that describe the shape of the data, or in other cases the shape of individual data points. There are numerous applications within health care, life sciences, finance, etc. In addition, topological methods are particularly suitable for producing “explainable” machine learning and artificial intelligence. I will survey the methods while presenting numerous examples.

 

The colloquium will take place in Lecture theatre 2.41, Fry Building at 16:00- 17:00 on Friday 13th March, followed by a wine reception in the Fry Common room. To help us plan catering, please complete this short registration form if you are planning to attend.

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Heilbronn Colloquium – Malle

27th March 2020

University of Bristol

We are delighted to welcome Gunter Malle to the University of Bristol to deliver a Heilbronn Colloquium.

Gunter Malle (Kaiserslautern) is a highly distinguished mathematician working in the areas of group theory, representation theory of finite groups, and connections to number theory.  He has made significant contributions to the Brauer height-zero conjecture, the Algerian conjecture and the McKay conjecture.  In number theory, he has made important contributions to our understanding of the distributions of class groups and of Galois groups.

Title: Local- global conjectures in representation theory

Abstract: The McKay conjecture from 1972 predicts that the number of odd
degree complex irreducible character of a finite group equals the same
quantity for the normaliser of a Sylow $2$-subgroup. This has become the
prototype of a whole series of similar local-global conjectures relating
properties of the representation theory of a finite group $G$ to data
encoded in $p$-local subgroups.

Recently, many of these conjectures have been reduced to (difficult)
questions on finite simple groups, thus opening the way to an
application of the classification. We will review some of these
conjectures and report on recent progress in the area.

 

The colloquium will take place in Lecture theatre 2.41, Fry Building at 16:00- 17:00 on Friday 27th March, followed by a wine reception in the Fry Common room. To help us plan catering, please complete this short registration form if you are planning to attend.

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Heilbronn Colloquium – Totaro

20th March 2020

University of Bristol

We are delighted to welcome Burt Totaro to the University of Bristol to deliver a Heilbronn Colloquium.

Burt Totaro FRS is an exceptionally distinguished mathematician specialising in algebraic geometry and algebraic topology.  He was the Lowndean Professor of Astronomy and Geometry in Cambridge before moving to UCLA in 2012. He has made significant contributions to research on the Hodge Conjecture and to uncovering the fundamental topological structure of algebraic geometry.

The colloquium will take place in Lecture theatre 2.41, Fry Building at 16:00- 17:00 on Friday 20th March, followed by a wine reception in the Fry Common room. To help us plan catering, please complete this short registration form if you are planning to attend.

Title and abstract will be published shortly.

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Heilbronn Distinguished Lecture Series – Amie Wilkinson

University of Bristol

We are pleased to announce that the 2020 Heilbronn Distinguished Lecture Series will be given by Professor Amie Wilkinson, University of Chicago. The talks will take place over three days:

11th May, Colloquium in LT LG.02, Fry Building, 16.00 followed by wine reception in the Fry Common Room.
Please register for the colloquium here.

12th May, G.09, Fry Building, 16.00 (no registration required)

13th May, G.09, Fry Building, 16:00 (no registration required)

Colloquium title and abstract:

Title: Symmetry and asymmetry in dynamics

Abstract: In classical mechanics, symmetry occurs for a reason: there is a conserved quantity such as angular momentum. This is Noether’s theorem, and it points to a broader theme in dynamics that symmetry is rare and meaningful. I will discuss, in the contexts of modern dynamics and geometry, how this theme recurs in beautiful ways: on the one hand, a typical object has the minimum amount of symmetry possible, and on the other hand, a little extra symmetry implies a lot of symmetry, a phenomenon known as rigidity.

 

Travel support for UK based PhD students may be available, please contact heilbronn-coordinator@bristol.ac.uk with any requests by 17th April.
We are pleased to consider applications for funding to support care costs.*

This event is organised in collaboration with the Heilbronn Institute of Mathematical Research.

*Applies to expenses incurred exceptionally as a result of attending the lecture series. Please contact heilbronn-coordinator@bristol.ac.uk for further information.

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