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Archive : Hallenbeck Grad Student Seminar

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TBA174TBAZoom: https://udel.zoom.us/j/93317448538 <br>Title: TBA <br> <br>Abstract: TBA <br> 10/7/2020 3:00:00 PM12/2/2020 5:00:00 PM
Speaker: Himanshu Gupta178Speaker: Himanshu GuptaZoom: https://udel.zoom.us/j/93317448538 <br>Title: The smallest eigenvalues of Graphs<br> <br>Abstract: In this talk, we see the various connections of the structural properties of graph with its eigenvalues. We are interested in the smallest and the second-largest eigenvalues. In 2018, Brouwer, Cioaba, Ihringer, and McGinnis proved a conjecture by Van Dam and Sotirov on the smallest eigenvalue of (distance-j) Hamming graphs and a conjecture by Karloff on the smallest eigenvalue of (distance-j) Johnson graphs. These authors also started investigating the smallest eigenvalue of Grassmann and Bilinear graphs. I will talk about the conjectures by Brouwer, Cioaba, Ihringer, and McGinnis on the eigenvalues of Grassmann and Bilinear graphs and the progress we have made so far.<br> 11/4/2020 4:00:00 PM11/4/2020 5:00:00 PM
Speaker: Nick Russell181Speaker: Nick RussellZoom: https://udel.zoom.us/j/93317448538 <br>Title: Characterizing Structural Behaviors for Collective Motion: Microscopic Decisions Lead to Macroscopic Dynamics <br> <br>Abstract: Several types of organisms utilize an array of techniques to communicate with one another, either explicitly or implicitly. This communication often produces some form of collective behavior, whereby a group of these organisms form patterns, produce a consensus, and/or move synchronously with each other. There is great interest from scientists in finding and understanding the underlying mechanisms governing these types of collective behavior. These mechanisms usually take place in the microscale, on an individual level, and lead to macroscopic effects. In this talk, I will highlight efforts to characterize different flocking mechanisms by understanding the microscopic structure of aggregations and flocks using techniques from statistical physics, biology, and dynamical systems. <br> 10/28/2020 3:00:00 PM10/28/2020 4:00:00 PM
Seminar Canceled179Seminar Canceled<br> Due to unfortunate circumstances, there will be no HGSS this week. We look forward to seeing you on 10/28/2020, where our speaker will be Nick Russell. <br> 10/21/2020 3:00:00 PM10/21/2020 4:00:00 PM

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  • Department of Mathematical Sciences
  • University of Delaware
  • 501 Ewing Hall
  • Newark, DE 19716, USA
  • Phone: 302-831-2653
  • math-questions@udel.edu