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Archive : Discrete Mathematics

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Zilin Jiang from MIT Zilin Jiang from MIT EWG 336Title:Equiangular lines with a fixed angle <br><br> Abstract: A set of lines through the origin in a Euclidean space is called equiangular if they are pairwise separated by the same angle. It is known that the maximum size of an equiangular set of lines grows quadratically as the dimension of the Euclidean space grows. However, when the angle is held fixed, a very different yet intricate behavior of the maximum size emerges. In this talk, I will explain how the determination of this behavior connects to some central notions in spectral graph theory, namely, the maximum eigenvalue of a graph and the multiplicity of the second largest eigenvalue. <br> Joint work with Alexandr Polyanskii, Jonathan Tidor, Yuan Yao, Shengtong Zhang and Yufei Zhao. 3/26/2020 6:00:00 PM3/26/2020 7:00:00 PMFalse
Xiaoye Liang from Anhui University, China and WPI Xiaoye Liang from Anhui University, China and WPIEWG 336Title:Terwilliger algebra of the Johnson scheme <br><br> Abstract: <a href="https://www.mathsci.udel.edu/content-sub-site/Documents/abstract.pdf">To view the abstract click here</a>3/19/2020 6:00:00 PM3/19/2020 7:00:00 PMFalse
Melissa Fuentes from University of DelawareMelissa Fuentes from University of DelawareEWG 336Title:The Maximum Number of q-Colorings of Graphs With Fixed Numbers of Vertices and Edges <br><br> Abstract: <a href="https://www.mathsci.udel.edu/content-sub-site/Documents/Abstract%20-%20Melissa%20Fuentes%20-%20Discrete%20Seminar%20March%2012%2c%202020.pdf">Click here to view the abstract</a> 3/12/2020 6:00:00 PM3/12/2020 7:00:00 PMFalse
Apoorva KhareApoorva KhareEWG 336Title:Distance matrices of trees: invariants, old and new <br><br> Abstract: : <a href="https://www.mathsci.udel.edu/content-sub-site/Documents/ApoorvaKhareWinter2020.pdf"> View Abstract</a> 2/7/2020 2:00:00 PM2/7/2020 3:00:00 PMFalse

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