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Thursday, March 29, 2018 — 3:30 PM EDT

**Title**: Knots and their (embedded) graphs

Speaker: | Iain Moffatt |

Affiliation: | Royal Holloway University of London |

Room: | MC 5479 |

**Abstract**:

There is a classical and well-known way to describe an alternating knot or link as a plane graph, known as its Tait graph.

Wednesday, March 28, 2018 — 4:00 PM EDT

**Title**: Tractable Approximations to Robust Conic Optimization Problems (paper by D. Bertsimas, M. Sim)

Speaker: | Matthew William Slavin |

Affiliation: | University of Waterloo |

Room: | MC 5479 |

**Abstract**: We review the paper listed in the title of this talk. In the paper, Bertsimas and Sim propose a relaxed robust counterpart for general conic optimization problems

Tuesday, March 27, 2018 — 4:00 PM EDT

**Title**: Implementing cryptography at scale

Speaker: | Edward Knapp |

Affiliation: | |

Room: | MC 5501 |

**Abstract**: Many cryptographic primitives have rough edges which make them difficult to use properly (by both experts and non-experts).

Monday, March 26, 2018 — 1:00 PM EDT

**Title**: LWE Part 2: A quantum discrete Gaussian sampler.

Speaker: | Luis Ruiz |

Affiliation: | University of Waterloo |

Room: | MC 6486 |

**Abstract:** In this talk we will describe how a (quantum) Gaussian sampler could be constructed if we had access to a solver of a decoding problem.

Friday, March 23, 2018 — 3:30 PM EDT

Title: Morphisms of complex Hadamard matrices

Speaker: | Padraig O Cathain |

Affiliation: | Worcester Polytechnic University |

Room: | MC 5501 |

Abstract:

Let M be a matrix with complex entries of unit norm. A well-known theorem of Hadamard bounds the magnitude of the determinant of M as a function of its dimension, and M is a complex Hadamard matrix if M meets Hadamard's bound with equality.

Thursday, March 22, 2018 — 3:30 PM EDT

**Title**: Excluding claws in binary matroids

Speaker: | Kazuhiro Nomoto |

Affiliation: | University of Waterloo |

Room: | MC 5479 |

**Abstract: **A simple binary matroid is claw-free if no rank-3 flats are independent. We discuss an exact structure theorem for such matroids and sketch its proof. This is joint work with Peter Nelson.

Thursday, March 22, 2018 — 1:30 PM EDT

**Title**: Unitary groups over finite fields

Speaker: | Chris Godsil |

Affiliation: | University of Waterloo |

Room: | MC 6486 |

**Abstract**: I will discuss the unitary groups over finite fields, and the structures on which they act (these include 2-designs and generalized quadrangles).

Wednesday, March 21, 2018 — 4:00 PM EDT

**Title**: D. Bertsimas, I. Popescu - Optimal inequalities in probability theory: A convex optimization approach

Speaker: | Ashkay Ramachandran |

Affiliation: | University of Waterloo |

Room: | MC 5479 |

**Abstract**: Abstract. We propose a semidefinite optimization approach to the problem of deriving tight moment

Friday, March 16, 2018 — 3:30 PM EDT

**Title:** A George Szekeres formula for restricted partitions

Speaker: | Bruce Richmond |

Affiliation: | University of Waterloo |

Room: | MC 5501 |

**Abstract:**

We give asymptotic formulas for the number of integer partitions of n with at most j parts and having largest part at most r, say A(n,j,r). We do this also for the number of partitions of n with largest part equal to r and having exactly j parts, say C(n,j,r).

Thursday, March 15, 2018 — 1:30 PM EDT

**Title**: Quantum State Transfer

Speaker: | Christopher van Bommel |

Affilliation: | University of Waterloo |

Room: | MC 6486 |

**Abstract**:

Many quantum algorithms may be modeled as a quantum process occurring on a graph. We interpret quantum channels implemented by spin chains as wires for transmission of states.

Wednesday, March 14, 2018 — 4:00 PM EDT

**Title: Data-driven Inverse Optimization with Imperfect Information**

Speaker: | Stefan Sremac |

Affilliation: | University of Waterloo |

Room: | MC 5479 |

**Abstract:**

We continue our reading group with a paper by Kuhn et al with the same title as above.

Tuesday, March 13, 2018 — 4:30 PM EDT

**Title**: What's an amplituhedron?

Speaker: | Cameron Marcott |

Affilliation: | University of Waterloo |

Room: | MC 5501 |

**Abstract**:

I'll introduce the amplituhedron, focusing on why the suffix "hedron" is justified.

Monday, March 12, 2018 — 1:30 PM EDT

**Title:** LWE Part 1: The problem, the cryptosystem and its relationship to lattice Problems

Speaker: | Luiz Ruiz |

Affiliation: | University of Waterloo |

Room: | MC 6486 |

**Abstract:**

In this talk we will give an overview of the Learning With Errors problem,

Friday, March 9, 2018 — 3:30 PM EST

**Title:** Chromatic Symmetric Functions and H-Free Graphs

Speaker: | Angèle Hamel |

Affiliation: | Wilfrid Laurier University |

Room: |
MC 2038 (not 5501) |

**Abstract:**

Chromatic symmetric functions are defined in terms of colourings of particular graphs. Some key conjectures in this area concern whether chromatic symmetric functions of claw-free graphs can be written in terms of other symmetric functions with positive coefficients.

Thursday, March 8, 2018 — 3:30 PM EST

**Title:** Claws, ω and χ: induced binary submatroids

Speaker: | Peter Nelson |

Affilliation: | University of Waterloo |

Room: | MC 5479 |

**Abstract:**

I will discuss the interplay between clique number, chromatic number, and excluding induced submatroids in the setting of binary matroids.

Thursday, March 8, 2018 — 1:30 PM EST

**Title:** Unitary Groups, II

Speaker: | Chris Godsil |

Affiliation: | University of Waterloo |

Room: | MC 6486 |

**Abstract:**

Actually the title should be 2 Unitary groups - I will discuss the 2-dimensional unitary groups.

Monday, March 5, 2018 — 3:30 PM EST

**Title:** Traveling Salesman Problems

Speaker: | William (Bill) Cook |

Affiliation: | University of Waterloo |

Room: | MC 5417 |

**Abstract:**

We discuss open research questions, both theoretical and computational, surrounding the traveling salesman problem.

Thursday, March 1, 2018 — 3:30 PM EST

**Title:** Counting matroids

Speaker: | Jorn van der Pol |

Affiliation: | University of Waterloo |

Room: | MC 5479 |

**Abstract:**

We discuss several recent results concerning matroid enumeration and typical properties of matroids, emphasizing the central role that sparse paving matroids play in these results.

Thursday, March 1, 2018 — 1:30 PM EST

**Title:** Unitary Groups

Speaker: | Chris Godsil |

Affiliation: | University of Waterloo |

Room: | MC 6486 |

**Abstract:**

Unitary groups play an important role in physics and in finite geometry. This talk, the first of two, will provide an introduction to the topic focusing on the case where the underlying field is the complex numbers.

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