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DTSTART:20220313T070000
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DTSTART:20211107T060000
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DTSTART;TZID=America/Toronto:20220912T200000
SEQUENCE:0
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URL:https://uwaterloo.ca/combinatorics-and-optimization/events/algebraic-gr
 aph-theory-seminar-qianqian-yang
SUMMARY:Algebraic Graph Theory Seminar - Qianqian Yang
CLASS:PUBLIC
DESCRIPTION:TITLE: On sesqui-regular graphs with fixed smallest eigenvalue 
 \n\nSpeaker:\n Qianqian Yang\n\nAffiliation:\n Shanghai University\n\nLoca
 tion:\n Contact Sabrina Lato for Zoom link\n\nABSTRACT: Let λ ≥ 2 be an
  integer. For strongly regular graphs with\nparameters (v\, k\, a\, c) and
  fixed smallest eigenvalue −λ\, Neumaier\ngave two bounds on c by using
  algebraic property of strongly regular\ngraphs. Subsequently\, we studied
  a new class of regular graphs called\nsesqui-regular graphs\, which conta
 ins strongly regular graphs as a\nsubclass\, and proved that for a given s
 esqui-regular graph with\nparameters (v\, k\, c) and smallest eigenvalue 
 −λ\, if k is very\nlarge\, then either c ≤ λ² (λ − 1) or v − k
  − 1 ≤\n(λ−1)²/4 + 1. This is joint work with Jack Koolen\, Brhane
 \nGebremichel and Jae Young Yang
DTSTAMP:20260418T190819Z
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