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September 2024
Atlantic Graph Theory Seminar
Title: How do we use graphs to transmit quantum information? Time: 3.30pm, Atlantic time, (1:30, CDT) Wednesday Sept. 18 Speaker: Hermie Monterde, University of Manitoba Abstract: In this talk, a graph $G$ represents a quantum spin network (a networking of interacting subatomic particles). The vertices and edges of $G$ represent the particles and their interactions in the network. Consider the complex unitary matrix $U(t)=\exp(itA)$, where $A$ is the adjacency matrix of $G$, $i^2=-1$ and $t$ is a real number. The propagation of quantum…
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Recolouring Graphs: Decompositions, A Dichotomy Theorem and Frozen Colourings Speaker: Kathie Cameron, Wilfrid Laurier University A k-colouring of a graph G is an assignment of at most k colours to the vertices of a graph so that the ends of each edge of the graph get different colours. We consider the question: When it is possible to obtain any k-colouring from any other by changing the colour of one vertex at a time, while always having a k-colouring? This question is equivalent to asking whether the “reconfiguration…
Find out more »October 2024
Atlantic Graph Theory Seminar
The Martin Invariant and Other Results on the Interlace Polynomials Josephine Reynes, University of Waterloo There are many well studied graph polynomials, but this talk will focus on the Martin polynomial and the interlace polynomial. Specifically, this talk will look at how these two polynomials are related and how results on the Martin polynomial can be extended to the interlace polynomial. The Martin invariant, a specific evaluation of the Martin polynomial, obeys the symmetries of the Feynman period. The Feynman…
Find out more »2024 Science Atlantic Mathematics Statistics and Computer Science Undergraduate Student Conference
The 2024 Science Atlantic Mathematics, and Computer Science Conference will take place at Acadia University during October 4-5, 2024. The conference will consist of a collection of invited plenary lectures, mathematics and computer science competitions and scientific research presentations by undergraduate students. The conference is part of the larger annual Science Atlantic Mathematics, Statistics and Computer Science Conference series. One overall aim of this exciting conference series is to bring together undergraduate students and faculty from universities based in Atlantic…
Find out more »Atlantic Graph Theory Seminar
Speaker #1: Peter Collier, Dalhousie University Title #1: Zero Forcing on Twisted Hypercubes Abstract #1: The hypercube stands out as a compelling and versatile structure that extends the geometric notion of a cube into higher dimensions. We study the twisted hypercube variant in an attempt to optimize processes on similarly degree-regular, highly connected graphs. The particular process we optimize is zero forcing, a graph infection process in which a particular colour change rule is iteratively applied to the graph and an…
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Some problems on graph sequences David Galvin, University of Notre Dame I'll talk about some problems concerning unimodality (or otherwise) of some graph sequences that come from enumeration. The focus will be on the matching sequence, the independent set sequence and the domination sequence of a graph. As well as mentioning some recent work (with Ball, Hyry, Taylor and Weingartner, and with Zhang), I'll describe some favorite open problems. Zoom link: https://us02web.zoom.us/j/86861499971?pwd=rTDAaju0TCu24asnaBGvkuNlT11KZ1.1 Meeting ID: 868 6149 9971 Passcode: 325258
Find out more »November 2024
Atlantic Graph Theory Seminar
On the two table case of the directed Oberwolfach problem Speaker: Alice Lacaze-Masmonteil, University of Regina A directed variant of the famous Oberwolfach problem, the directed Oberwolfach problem considers the following scenario. Given n people seated at t round tables of size m1,m2 . . . ,mt , respectively, such that m1+m2+· · ·+mt = n, does there exist a set of n−1 seating arrangements such that each person is seated to the right of every other person precisely once?…
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Speaker: Iain Beaton, Acadia University Title: Reconfiguring minimal dominating sets under a generalization of token sliding Abstract: A dominating set S in a graph is a subset of vertices such that every vertex is either in S or adjacent to a vertex in S. A minimal dominating set M is a dominating set such that M −v is not a dominating set for all v ∈ M. In this talk we introduce a reconfiguration graph R(G) for minimal dominating sets…
Find out more »University of New Brunswick Data Challenge 2024
The UNB Data Challenge 2024 will be the 9th iteration of the nationwide competition on Nov. 29, 2024, in a virtual format. Take up the challenge and demonstrate the power of data. Participants and teams will be able to showcase their ability to tell a story driven by data in unique competitive formats. It is an ideal setting for citizens to get engaged, meet leaders in academia, government, and private organizations, and explore the world of data science.
Find out more »December 2024
AARMS Doctoral Thesis Award Winner Seminar
A tangent category approach to operadic geometry Marcello Lanfranchi December 19, 2024 @ 1:30pm Abstract: A tangent category consists of a collection of abstract objects equipped with a structure, called a tangent structure, which makes those abstract objects into locally linear geometric spaces. In my thesis, I introduced and studied a list of geometric theories from the perspective of tangent category theory. In particular, I showed that each (opposite) category of algebras, such as associative, commutative, or Lie algebras, comes equipped with a tangent structure…
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