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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?…
Find out more »Atlantic Graph Theory Seminar
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…
Find out more »January 2025
Atlantic Graph Theory Seminar
Speakers: Prangya Parida, U. Ottawa, and Kiara McDonald, U. Victoria Zoom link: https://us02web.zoom.us/j/86415230827?pwd=QUxLUnlMdWYzL05zSUJ4bnBCOUJnZz09 --------------------------------------------------- Prangya Parida: Title: Cover-free families on graphs Abstract: A family of subsets of a t-set is called a d-cover-free family if no subset is contained in the union of any d other subsets. We denote by t(d, n) the minimum t for which there exists a d-cover-free family of a t-set with n subsets. Cover-free families (CFF) have wide applications in combinatorial group testing, where a d-CFF(t, n) can be…
Find out more »Atlantic Graph Theory Seminar
Ramsey numbers of signed graphs Ben Seamone, Dawson College and Université de Montréal Abstract: Nathan Acheampong (Université de Montréal) Francis Clavette (Université de Montréal) Geˇna Hahn (Université de Montréal) Margaux Marseloo (Université Paris-Saclay) Viktor Paardekooper (Université de Montréal), and Ben Seamone* (Dawson College & Université de Montréal) A signed graph is a pair (G, σ) where G = (V,E) is a graph and σ : E(G) → {+, −} is a signature which assigns a sign to each edge of G. One well-studied operation on…
Find out more »Combinatorial Algebra meets Algebraic Combinatorics 22nd annual workshop
The Combinatorial Algebra meets Algebraic Combinatorics (CAAC) workshop is an annual meeting taking place in Canada since 2004, with a focus on the continuously evolving interactions between combinatorial algebra and algebraic combinatorics. These meetings provide a strong connection between the two communities and help with the development of these fields. Historically, the CAAC meetings provided opportunities for graduate students, postdoctoral fellows, and early career researchers to present their work, learn about new research directions in related fields, and establish future…
Find out more »Atlantic Graph Theory Seminar
Switching m-edge coloured graphs Speaker: Gary MacGillivray, University of Victoria Abstract: An m-edge-coloured graph consists of a set of vertices, any two of which are either joined by an edge of one of m colours or not joined at all. The operation of switching at a vertex v of an m-edge-coloured graph with respect to an element of a subgroup \Gamma of S_m permutes the colours of the edges incident with v. Switching defines an equivalence relation on the set…
Find out more »CRG Seminar: Modelling Fish Stock Biomass Dynamics in a Multi-gear Fishery and Determining the Stock Status
Abstract: A marine fishery is an important sector in many countries as it contributes towards the nutritional requirements of people and provides income and employment to the associated population. Compared to other natural resources fish being a living resource has the capacity for rebuilding through reproduction. Sustainable management of the marine fishery resources is very important to avoid resource depletion as well as collapse. Biomass of individual species needs to be estimated and its dynamics have to be studied regularly…
Find out more »February 2025
Atlantic Graph Theory Seminar
Kemeny's constant for Markov chains and random walks on graphs Speaker: Jane Breen, Ontario Tech University Kemeny's constant is an interesting and useful quantifier of how well-connected the states of a Markov chain are. Though it was first introduced in the 1960s, interest in this concept has recently exploded. This talk will provide an introduction to Markov chains, an overview of the history of Kemeny’s constant, discussion of some applications, and a survey of recent results, with an emphasis on…
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