PhD Defense  Aurel Meyer

Tue 6 Jul 2010, 12:30pm
SPECIAL
Graduate Student Centre, Room 203

Essential Dimension of Algebraic Groups

Graduate Student Centre, Room 203
Tue 6 Jul 2010, 12:30pm2:00pm
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UBC

Wed 7 Jul 2010, 4:00pm
Topology and related seminars
WMAX 110

Finiteness Obstructions for GSpaces up to hGequivalence

WMAX 110
Wed 7 Jul 2010, 4:00pm5:00pm
Abstract
Abstract: Two Gspaces X and Y are said to be hGequivalent if their Borel constructions are equivalent over BG. In this talk we introduce an obstruction which determines when a Gsphere X is hGequivalent to a finite Gsphere Y, at a prime p dividing the order of G. We will also discuss how to generalize this to a global finiteness obstruction, and, in the case of Gspheres, relate the finiteness obstruction to the dimension function of a Gsphere.
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PhD defense  James Clarkson

Fri 9 Jul 2010, 9:00am
SPECIAL
Graduate Student Centre, Room 203

Group Actions on Finite Homotopy Spheres

Graduate Student Centre, Room 203
Fri 9 Jul 2010, 9:00am10:00am
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Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Moscow

Tue 20 Jul 2010, 3:30pm
SPECIAL
Math Annex 1102

Difference equations: symmetries, exact solutions, conservation laws

Math Annex 1102
Tue 20 Jul 2010, 3:30pm4:30pm
Details
A review of several applications of Lie groups of transformations to difference equations, meshes (lattices) and difference functionals is presented. Examples of difference models (i.e. difference equations and appropriate meshes) which admit the same symmetry group as there continuous counterparts are presented.
For integrable cases of ODEs, discrete representations of ODEs ("an exact finitedifference scheme") are developed. Invariant variational problems for difference equations are considered. Lagrangian and Hamiltonian formalisms and Noethertype constructions for difference functionals, meshes and difference equations are illustrated by several examples.
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University of Western Ontario

Wed 21 Jul 2010, 3:00pm
Topology and related seminars
WMAX 216

Galois descent and pro objects

WMAX 216
Wed 21 Jul 2010, 3:00pm4:00pm
Abstract
A Galois descent theorem for ntypes will be displayed and explained. This result is used, together with an appropriate version of the homotopy theory of pro objects, to give a descent criterion for diagrams of spaces which are defined on the etale site of a field. The need for such a criterion first arose in connection with the algebraic Ktheory of fields.
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