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 Events
Graduate Students in Mathematics and Statistics
Western Canada and the Pacific Northwest
Mon 2 Jun 2014, 9:00am SPECIAL
PIMS Seminars and PDF Colloquiums
UBC (June 2-4, 2014)
PIMS Young Researchers Conference
UBC (June 2-4, 2014)
Mon 2 Jun 2014, 9:00am-5:30pm
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Matthew Folz
Yammer,Inc. (Microsoft)
Tue 3 Jun 2014, 2:00pm SPECIAL
Graduate Student Seminar
SCRF 100
From mathematician to data scientist: my experiences in moving from academia to industry
SCRF 100
Tue 3 Jun 2014, 2:00pm-3:00pm

Abstract

I'm a recent math Ph.D from UBC who is now working as a data scientist for Yammer (Microsoft) in San Francisco.  I'll give a brief overview of what data science is and what the day-to-day life of a data scientist at Yammer looks like.  As well, I'll talk about why I chose industry over a postdoc, the major differences between academia and industry, and what skills and talents tech companies (and my team) are looking for.

Note for Attendees

 Jointly with the PIMS Young Researcher's conference http://www.math.ubc.ca/~GradComm/YRC/
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CIMAT, Mexico
Fri 6 Jun 2014, 3:15pm SPECIAL
Topology and related seminars
ESB 4133
Compact Lie groups, p-compact groups and p-local H-spaces
ESB 4133
Fri 6 Jun 2014, 3:15pm-4:15pm

Abstract

The classification of p-compact groups was a great achievement towards the understanding of finite H-spaces. In this talk we will talk about the history of finite H-spaces beginning from compact Lie groups. Then we will introduce the notions of p-compact group and finite p-local H-space and give some examples. We will finish with some open questions in the area.
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Balin Fleming
University of Michigan, Ann Arbor
Mon 9 Jun 2014, 3:00pm
Algebraic Geometry Seminar
MATH 126
Log jet schemes
MATH 126
Mon 9 Jun 2014, 3:00pm-4:00pm

Abstract

The classical example of a log scheme is a variety X with a normal crossing divisor D. One can study differential forms on X with logarithmic (that is, order one) poles along D. Dual to these are log tangent vectors on (X, D), which have "zeroes along D." As ordinary jet schemes generalise tangent spaces, log jet schemes generalise log tangent spaces. We'll introduce the construction of log jet schemes for log schemes in the sense of K. Kato, which replace the divisor D with some combinatorial data, and some of their properties. This talk won't assume familiarity with jet schemes or log geometry.
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University of Utah
Mon 9 Jun 2014, 3:15pm SPECIAL
Topology and related seminars
ESB 4133
Laminations, trees, and Out(F)
ESB 4133
Mon 9 Jun 2014, 3:15pm-4:15pm

Abstract

Laminations and free group actions on R-trees are useful tools for studying the structure of elements of and subgroups of outer automorphisms groups of free groups, denoted Out(F). After introducing laminations and R-trees in the context of Out(F), we will mention some recent progress on various topics related to Out(F).

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Seoul National University, Korea.
Thu 12 Jun 2014, 3:00pm SPECIAL
Diff. Geom, Math. Phys., PDE Seminar
MATX 1118 [Notice the time and location change!]
Regularity estimates for nonlinear elliptic and parabolic problems
MATX 1118 [Notice the time and location change!]
Thu 12 Jun 2014, 3:00pm-4:00pm

Abstract

In this talk I will present some recent improvements in regularity estimates for the gradient of solutions to nonlinear elliptic and parabolic equations with nonstandard growth in irregular domains, In particular, when the nonhomogeneous terms belong to various function spaces including weighted Lebesgue spaces, Orlicz spaces and variable exponent spaces.




Note for Attendees

[Notice the time and location change!]
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Toulouse, France
Thu 12 Jun 2014, 3:15pm SPECIAL
Topology and related seminars
ESB 4133
Discontinuous action of Out(Fn) and discrete representations
ESB 4133
Thu 12 Jun 2014, 3:15pm-4:15pm

Abstract

For a free group F, there is a natural action of Out(F) on the space of representations Hom(F,PSL(2,C)). Minsky introduced an open subset PS(F) (for primitive stable representations) on which Out(F) acts properly discontinuously which is expected to be maximal. I will explain the definition of this set PS(F) and introduce examples and properties of primitive stable representations with discrete image.
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Alejandro Maass
CMM, Chile
Thu 12 Jun 2014, 4:00pm
Symbolic Dynamics and Ergodic Theory Seminar
Math Annex 1102
Eigenvalues of Cantor minimal systems of finite topological rank
Math Annex 1102
Thu 12 Jun 2014, 4:00pm-5:00pm

Abstract

In this talk we give a new necessary and sufficient condition for a complex number to be an eigenvalue of a Cantor minimal systems of finite topological rank. This condition aims to be a good tool to understand eigenvalues of classical systems like interval exchange transformations. The case of Toeplitz systems where our new criteria is useful is deeply discussed.
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Raimundo Briceno
UBC
Fri 13 Jun 2014, 5:00pm
Symbolic Dynamics and Ergodic Theory Seminar
Math 126
Strong spatial mixing and new conditions for topological pressure approximation
Math 126
Fri 13 Jun 2014, 5:00pm-6:30pm

Abstract

In the context of stationary nearest neighbor Gibbs measures mu satisfying strong spatial mixing, we present a new combinatorial property on the support of mu sufficient for approximation of topological pressure. We also give evidence that this property is in some cases necessary for strong spatial mixing to hold. Most of these results are extensions of results obtained by D. Gamarnik - D. Katz (2009) and B. Marcus - R. Pavlov (2013), who gave a special representation of topological pressure in terms of conditional probabilities.
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KIAS
Wed 18 Jun 2014, 2:00pm
CRG Geometry and Physics Seminar
ESB 4127 (host: UBC)
Relative BPS state counts for toric Del Pezzo surfaces
ESB 4127 (host: UBC)
Wed 18 Jun 2014, 2:00pm-3:00pm

Abstract

Let S be a smooth Del Pezzo surface. We introduce three seemingly unrelated sets of invariants: local BPS state counts of S, relative BPS state counts of S relative to a smooth anticanonical divisor, and generalized DT invariants of the m-loop quiver. We explain how these invariants are connected and how they provide new insight into a conjecture by N. Takahashi on log mirror symmetry.

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Gourab Ray, PhD Candidate
Mathematics, UBC
Fri 20 Jun 2014, 4:00pm SPECIAL
One Time Event
Room 203 Graduate Student Centre (6371 Crescent Road)
Doctoral Exam: Hyperbolic Random Maps
Room 203 Graduate Student Centre (6371 Crescent Road)
Fri 20 Jun 2014, 4:00pm-6:30pm

Details

 Random planar maps have been an object of utmost interest over the last decade and half since the pioneering works of Benjamini and Schramm, Angel and Schramm and Chassaing and Schaeffer. These maps serve as models of random surfaces, the study of which are very important with motivations from physics, combinatorics and ramdom geometry.

Uniform infinite planar maps, introduced by Angel and Schramm which are obtained as local limits of uniform finite maps embedded in the sphere, serve as very important discrete model of infinite random surfaces. Recently, there has been growing interest to create and understand hyperbolic versions of such uniform infinite maps and several conjectures and proposed models have been around for some time. In this thesis, we mainly address these questions from several viewpoints and gather evidence of their existence and nature.

The thesis can be broadly divided into two parts. The first part is concerned with half planar maps or maps embedded in the upper half plane which enjoy a certain domain Markov property, a property which is reminiscent of that of the SLE curves.

The second part concerns investigating unicellular maps or maps with one face embedded in a high genus surface. The main motivation for studying the unicellular maps is the hope that this will shed some light into understanding the local limit of general maps via some well-known bijective techniques.
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