Atlantic Graph Theory Seminar
January 14, 2026 @ 3:30 pm - 4:30 pm
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.
Zoom link:
https://us02web.zoom.us/j/88013261876?pwd=XGocyHqvseXY8metPztPoSuulEEejX.1
Meeting ID: 880 1326 1876
Passcode: 357963