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DTSTART:20220313T070000
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DTSTART;TZID=America/Toronto:20220912T200000
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URL:/combinatorics-and-optimization/events/algebraic-gr
 aph-theory-seminar-qianqian-yang
SUMMARY:Algebraic Graph Theory Seminar - Qianqian Yang
CLASS:PUBLIC
DESCRIPTION:Summary \n\nTITLE: On sesqui-regular graphs with fixed smallest
  eigenvalue \n\nSpeaker:\n Qianqian Yang\n\nAffiliation:\n Shanghai Univer
 sity\n\nLocation:\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 o
 n c by using algebraic property of strongly regular\ngraphs. Subsequently\
 , we studied a new class of regular graphs called\nsesqui-regular graphs\,
  which contains strongly regular graphs as a\nsubclass\, and proved that f
 or a given sesqui-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 Kool
 en\, Brhane\nGebremichel and Jae Young Yang\n 
DTSTAMP:20250524T101459Z
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