Organizers: Niranjan Ramachandran, Dio Margetis, and Leo Koralov
When:
Wednesday @ 3:15pm, Tea 2:45pm - 3:15 pm in room 3201
Where:
Math 3206
From time to time special colloquia are held on other days, sometimes as part of conferences.
Other special colloquia are the Aziz Lectures and Avron Douglis Memorial Lectures.

Archives: 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017

• #### Speaker: () -

When: Wed, September 13, 2017 - 3:15pm
Where: Kirwan Hall 3206
• #### Speaker: Samir Khuller (University of Maryland Computer Science ) - https://www.cs.umd.edu/users/samir/

When: Wed, September 20, 2017 - 3:15pm
Where: Kirwan Hall 3206

### View Abstract

Abstract: NP-complete problems abound in every aspect of our daily lives. One approach is to simply deploy heuristics, but for many of these we do not have any idea as to when the heuristic is effective and when it is not. Approximation algorithms have played a major role in the last three decades in developing a foundation for a better understanding of optimization techniques - greedy algorithms, algorithms based on LinearProgramming (LP) relaxations have paved the way for the design of (in some cases) optimal heuristics. Are these the best ones to use in âtypicalâ instances? Maybe, maybe not.

In this talk we will focus on two specific areas - one is in the use of greedy algorithms for a basic graph problem called connected dominating set, and the other is in the development of LP based algorithms for a basic scheduling problem in the context of data center scheduling.
• #### Speaker: (CMNS Dean's Office) -

When: Wed, September 27, 2017 - 3:15pm
Where: Kirwan Hall 3206
• #### Speaker: Vladimir Matveev (Friedrich-Schiller-UniversitÃ¤t Jena ) - http://users.minet.uni-jena.de/~matveev/

When: Wed, October 4, 2017 - 3:15pm
Where: Kirwan Hall 3206

### View Abstract

Abstract: We introduce a construction that associates a Riemannian metric $g_F$ (called the
Binet-Legendre metric) to a
given Finsler metric $F$ on a smooth manifold $M$. The transformation
$F \mapsto g_F$ is $C^0$-stable and has good
smoothness properties, in contrast to previously considered
constructions. The Riemannian metric $g_F$ also behaves nicely under
conformal or isometric transformations of the Finsler metric $F$ that
makes it a powerful tool in Finsler geometry. We illustrate that by
solving a number of named problems in Finsler geometry. In particular
we extend a classical result of Wang to all dimensions. We answer a
question of Matsumoto about local conformal mapping between two
Berwaldian spaces and use it to investigation of essentially conformally Berwaldian manifolds.
We describe all possible conformal self maps and all self similarities
on a Finsler manifold, generasing the famous result of Obata to Finslerian manifolds. We also classify all compact conformally flat
Finsler manifolds. We solve a conjecture of Deng and Hou on locally
symmetric Finsler spaces. We prove smoothness of isometries of Holder-continuous Finsler metrics. We construct new easy to calculate''
conformal and metric invariants of finsler manifolds.
The results are based on the papers arXiv:1104.1647, arXiv:1409.5611,
arXiv:1408.6401, arXiv:1506.08935,
arXiv:1406.2924
partially joint with M. Troyanov (EPF Lausanne) and Yu. Nikolayevsky (Melbourne).
• #### Speaker: General Departmental Meeting () -

When: Wed, October 11, 2017 - 3:15pm
Where: Kirwan Hall 3206
• #### Speaker: Departmental Meeting () -

When: Wed, October 18, 2017 - 3:15pm
Where: Kirwan Hall 3206
• #### Speaker: Departmental Meeting () -

When: Wed, October 25, 2017 - 3:15pm
Where: Kirwan Hall 3206
• #### Speaker: Xuhua He (UMD) - http://www.math.umd.edu/~xuhuahe/

When: Wed, November 1, 2017 - 3:15pm
Where: Kirwan Hall 3206
• #### Speaker: Pierre-Emmanuel Jabin (UMD) - http://www2.cscamm.umd.edu/~jabin/

When: Wed, November 8, 2017 - 3:15pm
Where: Kirwan Hall 3206
• #### Speaker: Simon Levin (Princeton ) -

When: Wed, November 15, 2017 - 3:15pm
Where: Kirwan Hall 3206

### View Abstract

Abstract: TBA
• #### Speaker: Held for Special Lecture (TBA) -

When: Wed, November 29, 2017 - 3:15pm
Where: Kirwan Hall 3206
• #### Speaker: Held for Special Lecture () -

When: Wed, December 6, 2017 - 3:15pm
Where: Kirwan Hall 3206
• #### Speaker: Daniel Tataru (UC Berkeley) - https://math.berkeley.edu/~tataru/

When: Fri, December 8, 2017 - 3:15pm
Where: Kirwan Hall 3206
• #### Speaker: Shrawan Kumar (UNC at Chapel Hill) - http://www.unc.edu/math/Faculty/kumar/

When: Wed, January 24, 2018 - 3:15pm
Where: Kirwan Hall 3206

### View Abstract

Abstract: TBA
• #### Speaker: Claude Le Bris () -

When: Wed, February 7, 2018 - 3:15pm
Where: Kirwan Hall 3206
• #### Speaker: Ivan Cheltsov (University of Edinburgh, UK) - http://www.maths.ed.ac.uk/cheltsov/

When: Wed, February 21, 2018 - 3:15pm
Where: Kirwan Hall 3206
• #### Speaker: Richard Schwartz (Brown University) - http://www.math.brown.edu/~res/

When: Wed, March 14, 2018 - 3:15pm
Where: Kirwan Hall 3206