Events - May 2018

Tuesday, May 29, 2018 — 4:30 PM EDT

Hongdi Huang, Department of Pure Mathematics, & William Dugan, Department of Combinatorics & Optimization, University of Waterloo

"An introduction to Kreimer's Hopf algebra and Grossman-Larson Hopf algebra"

Tuesday, May 29, 2018 — 1:30 PM EDT

Daniel Pepper, Department of Pure Mathematics, University of Waterloo

In this learning seminar we will study some basic facts about the free probability analogue of the Brownian motion, and about how one can do stochastic integration against the free Brownian motion.  The framework used will be the one of a C*-probability space.  The main reference followed will be a paper by P. Biane and R. Speicher titled "Stochastic calculus with respect to free Brownian motion and analysis on Wigner space" (in Probability Theory and Related Fields, 1998).

M3 3103

Monday, May 28, 2018 — 4:00 PM EDT

Malabika Pramanik, University of British Columbia

"Configurations in sets big and small"

Friday, May 25, 2018 — 3:30 PM EDT

Jorge Galindo, Universitat Jaume I

"\ell_1-sequences and Arens regularity of the Fourier algebra"

The Fourier algebra A(G) of a locally compact Abelian group G is the algebra of functions on G whose Fourier transforms are integrable on the dual group \widehat{G}. When G is not commutative, the definition of A(G) is more sophisticated and produces an often intriguing Banach Algebra that has interest from the perspectives of Harmonic Analysis and Operator Theory.

Friday, May 25, 2018 — 2:30 PM EDT

Andrew Swann, Aarhus University

"Toric geometry of G2 metrics"

Thursday, May 24, 2018 — 1:00 PM EDT

Jonathan Herman, Department of Pure Mathematics, University of Waterloo

"Weak Moment Maps in Multisymplectic Geometry"

We introduce the notion of a `weak (homotopy) moment map' associated to a Lie algebra action on a multisymplectic manifold.

We use weak moment maps to extend Noether's theorem from Hamiltonian mechanics by exhibiting a correspondence between multisymplectic conserved quantities and continuous symmetries on a multi-Hamiltonian system.

Wednesday, May 23, 2018 — 2:00 PM EDT

Mohammad Mahmoud, Department of Pure Mathematics, University of Waterloo

"Degree Invariant Functions and Martin's Conjecture"

This week we prove the Delay Lemma which is the essential part of proving that if our degree invariant function is strictly decreasing on a cone then it is constant on a cone.

MC 5417

Tuesday, May 22, 2018 — 10:30 AM EDT

Yifan Yang, National Taiwan University

"Equations of Shimura curves"

Shimura curves are generalizations of classical modular curves. Because of the lack of cusps on Shimura curves, there are very few explicit methods for Shimura curves. In this talk, we will introduce Borcherds forms and use them to determine the equations of Shimura curves. The construction of Borcherds forms is done by solving certain integer programming problems. This is a joint work with Jia-Wei Guo.

MC 5403

Friday, May 18, 2018 — 1:30 PM EDT

Ross Willard, Department of Pure Mathematics, University of Waterloo

"Uncountable SIs in residually small varieties in a countable signature, Part V"

Having assembled the pieces, I will attempt to put them together to prove the theorem of McKenzie and Shelah.

MC 5479

Thursday, May 17, 2018 — 4:00 PM EDT

Josh Hews, Department of Pure Mathematics, University of Waterloo

"Algorithms for 3-Manifolds"

Wednesday, May 16, 2018 — 3:30 PM EDT

Jacob Campbell, Department of Pure Mathematics, University of Waterloo

We will study a class of compact quantum groups whose structure and representation theory depend on the combinatorics of set partitions, and we will also study some "noncommutative spaces" on which these quantum groups act.  The emphasis of the presentations will be placed on the illustrative examples provided by the quantum permutation group and by the free orthogonal quantum group.

Wednesday, May 16, 2018 — 2:00 PM EDT

Mohammad Mahmoud, Department of Pure Mathematics, University of Waterloo

"Degree invariant functions and Martin's Conjectures"

We will continue the proof we started for the special case of Martin's conjecture.  That special case result says: Assuming the Axiom of Determinacy, a uniformly degree invariant function that is not increasing on a cone must be constant on a cone. 

MC 5403

Friday, May 11, 2018 — 1:30 PM EDT

Ross Willard, Department of Pure Mathematics, University of Waterloo

"Uncountable SIs in residually small varieties in a countable signature, part IV"

Continuing the proof of "the theorem" of McKenzie and Shelah, I will define how the types realized over a countable set in a maximal special subdirectly irreducible algebra form a compact T1 second countable topological space.

MC 5479

Wednesday, May 9, 2018 — 2:00 PM EDT

Mohammad Mahmoud, Department of Pure Mathematics, University of Waterloo

"Degree invariant functions and Martin's Conjectures"

We will go through a theorem which proves a special case of one of Martin's conjectures about degree (Turing) invariant functions. The theorem says: Assuming the Axiom of Determinacy, a uniformly degree invariant function that is not increasing on a cone must be constant on a cone. The theorem is about a uniformly degree invariant function while the conjecture is about any degree invariant function, not necessarily uniformly.

Friday, May 4, 2018 — 2:00 PM EDT

Ross Willard, Department of Pure Mathematics, University of Waterloo

"Uncountable SIs in residually small varieties in a countable signature, part III"

Continuing the proof of "the theorem" of McKenzie and Shelah, I will prove a technical theorem about the automorphism groups of maximal special subdirectly irreducible members in the relevant varieties.  Then I will assemble the pieces to show that the types realized in a maximal special subdirectly irreducible algebra form a compact second countable topological space.

MC 5479

Wednesday, May 2, 2018 — 3:30 PM EDT

Janez Bernik, University of Ljubljana

"Quasi-filiform Lie algebras of maximum length revisited"

Wednesday, May 2, 2018 — 2:00 PM EDT

Michael Deveau, Department of Pure Mathematics, University of Waterloo

"Games, Determinacy and Martin's Theorem"

We first define the notion of a game and then discuss the Axiom of Determinacy (AD), which is inconsistent with ZFC. We work instead in ZF + AD, and explore the consequences of AD as it relates to Turing degrees. In particular, we prove Martin's Theorem: assuming AD, every set of Turing degrees contains or omits a cone of degrees.

MC 5403

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