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November 2025
Atlantic Graph Theory Seminar
Date and Time: Wednesday, November 26, 3.40 pm Atlantic time Speaker: Himanshu Gupta, University of Regina Title: On the eigenvalues of the graphs D(5, q) Abstract: In 1995, Lazebnik and Ustimenko introduced the family of q-regular graphs D(k, q), which is defined for any positive integer k and prime power q. The connected components of the graph D(k, q) have provided the bestknown general lower bound on the size of a graph for any given order and girth to this…
Find out more »December 2025
Session on Combinatorial Design Theory at the 2025 CMS Winter Meeting
In the 18th century, several seemingly innocuous scheduling problems were proposed, often in the form of a puzzle. These problems were ultimately solved using tools and theoretical approaches that now lie in what is known as combinatorial design theory. Since then, this area of mathematics has seen tremendous growth in the diversity of designs, constructions, and applications that it encompasses. The purpose of this session is to showcase recent results in topics such as classical designs, cycle systems, graph decompositions,…
Find out more »ACCDMi symposium
The AARMS CRG for the Atlantic Canada Centre for Disease Ecology Modelling (ACCDMi) will have an online symposium on Wednesday December 10. The symposium will consist of ACCDMi members giving short talks to further the collaborative research of the CRG. Anyone interested in participating can email Dr. Amy Hurford (ahurford@mun.ca) for a link or can attend in-person in room AA-1043 on Memorial University’s St John’s campus. In addition, we invite you to attend Dr. Nicholas Ogden’s keynote talk that will occur as…
Find out more »January 2026
Advanced Simulation of Mathematical Models with Data Assimilation Workshop
The AARMS CRG “Advanced Simulation of Mathematical Models with Data Assimilation” will have its first workshop January 5th and 6th, 2026. The workshop will be held in the Mathematics and Statistics department on the St. John’s campus of Memorial University of Newfoundland. This workshop will serve two purposes: provide a data assimilation and PDEs bootcamp for CRG participants and collaborators, and to plan the future activities of the CRG. The bootcamp will bring the CRG participants (from diverse backgrounds) up…
Find out more »Atlantic Graph Theory Seminar
Colourings of Balanced Incomplete Block Designs That Are Almost Locally Equitable Date and Time: Wednesday, January 14, 3.40 pm Atlantic time Speaker: William Kellough, Memorial University of Newfoundland Abstract: In this talk, we study $\ell$-colourings of $(v,k,\lambda)$-BIBDs where within each block, one colour is absent and the rest appear exactly $\frac{k}{\ell-1}$ times. We give necessary conditions for such colourings to exist. We show how Hadamard matrices, affine planes, and twin prime powers can be used to construct such coloured BIBDs.…
Find out more »Atlantic Graph Theory Seminar
Speaker: Shahriyar Pourakbar Saffar, Memorial University of Newfoundland Title: Existence of uniquely 2-colourable 4-cycle decompositions: A constructive proof Abstract: A cycle system of order $n$ is a decomposition of the edges of the complete graph $K_n$ into cycles of a fixed length. A cycle system is said to be $k$-colourable if we can assign $k$ colours to its vertices so that no cycle is monochromatic. If a cycle system is $k$-colourable but not $(k-1)$-colourable, it is called $k$-chromatic. A $k$-colourable…
Find out more »Combinatorial Algebra Meets Algebraic Combinatorics at Dalhousie
CAAC is a unique conference centered around continually evolving interactions between combinatorial algebra and algebraic combinatorics, and featuring work done by junior people in the field.
Find out more »February 2026
Atlantic Graph Theory Seminar: Jorik Jooken – Feb 4
Speaker: Jorik Jooken, KU Leuven Kulak Title: On vertex-girth-regular graphs: (Non-)existence, bounds and enumeration Abstract: A vertex-girth-regular vgr(v,k,g,lambda)-graph is a k-regular graph of girth g and order v in which every vertex belongs to exactly lambda cycles of length g. While all vertex-transitive graphs are necessarily vertex-girth-regular, the majority of vertex-girth-regular graphs are not vertex-transitive. Similarly, while many of the smallest k-regular graphs of girth g, the so-called (k,g)-cages, are vertex-girth-regular, infinitely many vertex-girth-regular graphs of degree k and girth…
Find out more »Atlantic Graph Theory Seminar
Date and Time: Wednesday, February 11, 3.40 pm Atlantic time Speaker: JD Nir, Oakland University Title: The Second Common Neighbourhood Conjecture Abstract: The Second Common Neighbourhood Conjecture is a question about the structure of shared neighbours in a graph. At first glance, it seems like a nice problem for a new researcher to study: it requires only a basic understanding of graph theory to state, examples are easy to understand, and one can quickly prove the conjecture holds in certain…
Find out more »Atlantic Graph Theory Seminar
Date and Time: Wednesday, February 25, 3.40 pm Atlantic time Speaker: Erin Meger, Queens University Title: Decomposing Forbidden Minors for Pursuit-Evasion Abstract: In this talk, we consider the pursuit-evasion game Cops and Robbers. The game is played on a graph between two players: a set of cops and a single robber, who take turns moving along the edges. The cop number of a graph is the minimum number of cops needed to guarantee capture of the robber, meaning they eventually…
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