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 Events
Cory Simon and Maxim Stykow
UBC
Thu 1 Dec 2011, 12:30pm
Graduate Student Seminar
LSK 460
Graduate Student Colloquium
LSK 460
Thu 1 Dec 2011, 12:30pm-2:00pm

Abstract


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Kevin Doerksen
SFU
Thu 1 Dec 2011, 3:00pm
Number Theory Seminar
Room WMAX 216 (PIMS - UBC Campus)
On the prime divisors in zero orbits of families of commuting polynomials
Room WMAX 216 (PIMS - UBC Campus)
Thu 1 Dec 2011, 3:00pm-3:50pm

Abstract

Let (b_n) = (b_1, b_2, \dots) be a sequence of integers.  A primitive prime divisor of the k-th term is a prime which divides b_k but does not divide any previous term in the sequence.  A zero orbit of a polynomial f(x) is a sequence of integers (c_n) where the n-th term is the n-th iterate of f at 0.  We consider primitive prime divisors of zero orbits of polynomials and restrict to polynomials with zero linear term.  In this talk, we show that if zero has an infinite orbit, then b_n will have primitive prime divisors for all n \geq 3.
 
We then consider a generalized notion of primitive prime divisors as it applies to families of commutative polynomials.  We consider families of commutative polynomials which all have zero linear term and give an effective bound on the number of terms in the forward orbit of 0 which do not have primitive prime divisors.
 
This talk is based on joint work with Jason Bell and builds on previous joint work with Anna Haensch.

Note for Attendees

Refreshments will be served between the two talks.
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SFU
Thu 1 Dec 2011, 4:10pm
Number Theory Seminar
Room WMAX 216 (PIMS - UBC Campus)
The c_2 invariant of Feynman graphs
Room WMAX 216 (PIMS - UBC Campus)
Thu 1 Dec 2011, 4:10pm-5:00pm

Abstract

Last year Francis Brown and Oliver Schnetz defined the c_2 invariant of a graph.  Let p be prime, take the Kirchhoff polynomial of a graph, and count points on the variety of this polynomial over the finite field with p elements. For the graphs of interest to us, this point count will be divisible by p^2 and the result modulo p is the c_2 invariant at p.
 
This invariant has important things to say about the Feynman integrals of scalar Feynman graphs, and links together the combinatorial and algebro-geometric approaches to understanding Feynman integrals.
 
In this talk I will describe this setup and then explain some joint results with Francis Brown and Oliver Schnetz concerning the c_2 invariant of graphs with subdivergences.
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Northwestern University
Mon 5 Dec 2011, 2:00pm
Algebraic Geometry Seminar
WMAX 110
Higher analytic stacks
WMAX 110
Mon 5 Dec 2011, 2:00pm-3:00pm

Abstract

Using techniques from the theory of Banach algebras, Kuranishi constructed an analytic germ of the moduli space of deformations of a holomorphic vector bundle on a compact complex manifold. In order to extend his results to deformation theory of perfect complexes, we introduce higher analytic stacks, which are simplicial Banach analytic varieties satisfying a horn filler condition modeled on that satisfied by Kan complexes. We show that there is a natural way to attach a higher analytic stack to a Banach algebra, and apply this to the deformation theory of perfect complexes. This is a joint work with Kai Behrend.

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Northwestern University
Mon 5 Dec 2011, 3:10pm
Algebraic Geometry Seminar
WMAX 110
The coherent-constructible correspondence for toric varieties and hypersurfaces
WMAX 110
Mon 5 Dec 2011, 3:10pm-4:10pm

Abstract

The coherent constructible correspondence matches coherent sheaves on a toric variety to constructible sheaves on a compact torus T^n. Microlocal sheaf theory allows one to view the latter sort of object as a Lagrangian submanifold in the symplectic manifold T^n x R^n, making this a form of mirror symmetry. I will discuss this correspondence, and an extension of of it to hypersurfaces in toric varieties, which in some sense matches coherent sheaves to Legendrian submanifolds of the contact manifold T^n x S^{n-1}.
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Katya Yurasovskaya
CWSEI and UBC Department of Mathematics
Thu 8 Dec 2011, 11:30am SPECIAL
One Time Event
MATX 1102
Lunch Series on Teaching and Learning: What is a diagnostic test?
MATX 1102
Thu 8 Dec 2011, 11:30am-12:30pm

Details

Diagnostic test is a useful tool that you can build to measure and determine many aspects of your course and your incoming students: background, existing misconceptions, knowledge and beliefs about your subject - in short, anything you may wish to know and that will influence student learning in in your course. In the talk we will look at the diagnostic tests that have been built in our department for various courses, and discuss some practical issues of putting such a tool together.

If you are interested in creating a diagnostic test for a course you teach, please contact Mathematics Teaching and Learning Initiative - and we will build one for you, based on your needs and requirements. http://www.math.ubc.ca/~cwsei/
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UBC
Tue 13 Dec 2011, 2:00pm
Mathematical Education
MATX 1102
How To Evaluate The Students and Oneself as a Teacher?
MATX 1102
Tue 13 Dec 2011, 2:00pm-3:00pm

Abstract

Final presentation of the year!  All info under : http://wiki.ubc.ca/Sandbox:MathTeachingSeminar
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Fok-Shuen Leung and David Kohler
UBC
Tue 13 Dec 2011, 4:00pm SPECIAL
One Time Event
MATH 204
TA Accreditation Program Seminar: Should we use boards?
MATH 204
Tue 13 Dec 2011, 4:00pm-5:00pm

Details

This week's TAAP session will be a debate: be it resolved that blackboards and whiteboards should not be used in the classroom as a medium to transfer information for students. David Kohler will argue for the affirmative, and Fok-Shuen Leung will argue for the negative.

This is the fifth talk in the TA Accreditation Program Seminar Series; more information can be found at http://www.math.ubc.ca/~fsl/TAAP%20Seminar%20Series.html
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