Mohammad Mahmoud, Department of Pure Mathematics, University of Waterloo
"The Isomorphism Problem for Pregeometries"
We continue our proof for showing that the isomorphism problem for rice pregeometries with Condition B is $\Pi^0_3$-hard.
MC 5413
Ross Willard, Department of Pure Mathematics, University of Waterloo
"Dualizing structures that are necessarily of infinite signature, part 3: the gory details"
In this lecture I will finish Pitkethly’s proof that her schizophrenic pair is in fact a dualizing pair. If time remains, I’ll sketch the proof that the term operations of the algebra are not determined by any finite-signature alter ego.
MC 5403
[Talk rescheduled from February 6, 2019]
Sang-Gyun Youn, Queen's University
"Sobolev embedding properties on compact matrix quantum groups"
Abolfazl Alam, Shahid Beheshti University
"Model Companion for Bounded Theories and some Related Complexity Questions"
Alex Wright, University of Michigan
"Dynamics, geometry, and the moduli space of Riemann surfaces"
Rahim Moosa, Department of Pure Mathematics, University of Waterloo
"Etale descent"
Following the Bakker-Brunebarbe-Tsimerman paper, we show that quotients by etale equivalence relations exist for definable analytic spaces.
MC 5479
**This seminar has been cancelled and is rescheduled for February 27, 2019**
Mohammad Mahmoud, Department of Pure Mathematics, University of Waterloo
"The Isomorphism Problem for Pregeometries"
We continue our proof for showing that the isomorphism problem for rice pregeometries with Condition B is $\Pi^0_3$-hard.
MC 5413
Sanaz Pooya, Stockholm University
"On the Baum-Connes assembly map for certain semi-direct products"
Pat Naylor, Department of Pure Mathematics, University of Waterloo
"Diagrammatic Methods in Topology"
A recent tool for understanding 4-manifolds is something called a “trisection.” These have the interesting advantage of changing problems about 4-manifolds to problems of combinatorics on surfaces. This talk will be an (accessible) tourist’s guide to some background and similar ideas from low(er) dimensional topology: Heegaard splittings and diagrams. Time permitting, we’ll also introduce a trisection and discuss some recent developments.
**This talk was originally scheduled for February 12; it will now take place on February 14, 2019**
Nick Manor, Department of Pure Mathematics, University of Waterloo
"Do the Borromean rings exist?"