PhD Defense - Aurel Meyer
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Tue 6 Jul 2010, 12:30pm
SPECIAL
One Time Event
Graduate Student Centre, Room 203
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Essential Dimension of Algebraic Groups
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Graduate Student Centre, Room 203
Tue 6 Jul 2010, 12:30pm-2:00pm
Details
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UBC
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Wed 7 Jul 2010, 4:00pm
Topology and related seminars
WMAX 110
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Finiteness Obstructions for G-Spaces up to hG-equivalence
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WMAX 110
Wed 7 Jul 2010, 4:00pm-5:00pm
Abstract
Abstract: Two G-spaces X and Y are said to be hG-equivalent if their Borel constructions are equivalent over BG. In this talk we introduce an obstruction which determines when a G-sphere X is hG-equivalent to a finite G-sphere 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 G-spheres, relate the finiteness obstruction to the dimension function of a G-sphere.
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PhD defense - James Clarkson
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Fri 9 Jul 2010, 9:00am
SPECIAL
One Time Event
Graduate Student Centre, Room 203
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Group Actions on Finite Homotopy Spheres
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Graduate Student Centre, Room 203
Fri 9 Jul 2010, 9:00am-10:00am
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Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Moscow
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Tue 20 Jul 2010, 3:30pm
SPECIAL
One Time Event
Math Annex 1102
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Difference equations: symmetries, exact solutions, conservation laws
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Math Annex 1102
Tue 20 Jul 2010, 3:30pm-4:30pm
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 finite-difference scheme") are developed. Invariant variational problems for difference equations are considered. Lagrangian and Hamiltonian formalisms and Noether-type constructions for difference functionals, meshes and difference equations are illustrated by several examples.
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University of Western Ontario
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Wed 21 Jul 2010, 3:00pm
Topology and related seminars
WMAX 216
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Galois descent and pro objects
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WMAX 216
Wed 21 Jul 2010, 3:00pm-4:00pm
Abstract
A Galois descent theorem for n-types 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 K-theory of fields.
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