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November 2021
Dalhousie-AARMS AAMP Seminar: Nina Holden (ETH Zürich and the Courant Institute)
Conformal invariance of percolation on random planar maps Conformal invariance of critical percolation on the triangular lattice was proved by Smirnov. His proof is hard to extend to critical percolation on other lattices since his proof relies on a combinatorial identity which is only true on the triangular lattice. On random lattices known as random planar maps, however, it turns out that conformal invariance can be established. This was done in joint work with Sun, building on our earlier works…
Find out more »AARMS Scientific Machine Learning Seminar: Hamid Usefi (MUN)
Multicollinearity, singular vectors, and dimensionality reduction for high-dimensional datasets Single nucleotide polymorphisms (SNPs) as building blocks of our DNA, can determine the variations between people. It is believed that SNPs in genes that regulate DNA mismatch repair, cell cycle regulation, metabolism and immunity are associated with genetic susceptibility to cancer. So, SNPs are potential diagnostic and therapeutic biomarkers in many cancer types. This in part has prompted the rapid advancements in DNA sequencing which makes it possible both in terms…
Find out more »Atlantic Graph Theory Seminar: Pavol Hell (SFU)
I will discuss a few examples where considering loops leads to interesting insights, often allowing unifying existing results. These examples will include cops and robbers games, graph homomorphisms, variants of interval and chordal graphs, and versions of domination. Join Zoom Meeting: link
Find out more »University of New Brunswick Data Challenge
The Data Challenge will bring together three competitive events, the Open Data Visualization (6th annual), Data Analytics (2nd Edition), and Data Sprint (2nd Edition) on November 19, 2021 in a hybrid format - virtually & in-person! Take up the challenge and demonstrate the power of data, with the flexibility to take part remotely. Our previous edition saw 85 data-driven enthusiasts compete from across Canada in 30 teams. The event also saw 35 business experts, mentors, speakers & partners from diverse industries.…
Find out more »Dalhousie-AARMS AAMP Seminar: Amanda Young (Technical University of Munich)
Title: A bulk gap in the presence of edge states for a HaldanepseudopotentialAbstract: In this talk, we discuss a recent result on a bulk gap for atruncated Haldane pseudopotential with maximal half filling, whichdescribes a strongly correlated system of spinless bosons in a cylindergeometry. For this Hamiltonian with either open or periodic boundaryconditions, we prove a spectral gap above the highly degenerateground-state space which is uniform in the volume and particle number.Our proofs rely on identifying invariant subspaces to which…
Find out more »AARMS Scientific Machine Learning Seminar: Ben Adcock (Simon Fraser University)
Title: Tackling the curse: polynomial and deep neural network methods for function approximation in high dimensions Abstract: Many problems in computational science and engineering require the accurate approximation of a target function from data. This problem is rendered challenging by the high-dimensionality of the function, the expense of generating function samples, the presence of noise in the measurements, and the fact that the target function may take values in a function space. Developing techniques that tackle these challenges without succumbing…
Find out more »December 2021
Atlantic Graph Theory Seminar: James Preen (Cape Breton University)
There are many results about triangles in graphs, but the property that every edge in a graph is in at least one triangle seems not to have been studied before. The 4-regular case was quickly solved collaboratively following an internet posting and then written about by one author in their blog, before being published in the Journal of Graph Theory in 2013. However, the result that was originally wanted was a characterisation for 5-regular graphs, and that did not emerge…
Find out more »Dalhousie-AARMS AAMP Seminar: Jesse Gell-Redman (University of Melbourne)
Title: A Fredholm approach to scattering Abstract: We will give a friendly introduction to the scattering theory, specifically to the matrix for Schrodinger operators. We will then discuss how a new functional analytic approach to analysis of non-elliptic equations, due to Vasy, gives a conceptually attractive method for proving detailed regularity results for nonlinear scattering. This is joint work with several groups of authors including Andrew Hassell, Sean Gomes, Jacob Shapiro, and Junyong Zhang. The Dalhousie-AARMS Analysis-Applied Math-Physics Seminar takes place…
Find out more »AARMS Scientific Machine Learning Seminar: Peter Dueben (ECMWF)
This talk provides an overview on the machine learning efforts at the European Centre for Medium-Range Weather Forecasts (ECMWF), and outlines how machine learning, and in particular deep learning, could help to improve weather predictions in the coming years. The talk will name challenges for the use of machine learning and suggest developments (research/software/hardware) that should enable the community of Earth system modelling to make quick progress. Webex information: Link: https://mun.webex.com/mun/j.php?MTID=m32a22bd61d05707cefe973ca5bf6ad69 Meeting no: 2631 545 3588 Password: t32XHrsMqu6
Find out more »Atlantic Graph Theory Seminar: Sandra Kingan (Brooklyn College and Graduate Center, CUNY)
I will begin by giving a general overview of what it means to find monarchs for excluded minor classes of graphs and matroids. In a paper that appeared in 2018, I used the Strong Splitter Theorem to give a short proof of Oxley's result that the class of binary matroids with no 4-wheel minor consists of a few small matroids and an infinite family of maximal 3-connected rank r matroids known as the binary spikes. Such a family is called…
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