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DTSTART:20210314T070000
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DTSTART;TZID=America/Toronto:20220131T113000
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URL:/combinatorics-and-optimization/events/algebraic-gr
 aph-theory-seminar-steve-butler
SUMMARY:Algebraic Graph Theory Seminar - Steve Butler
CLASS:PUBLIC
DESCRIPTION:Summary \n\nTITLE: Hadamard diagonalizable graphs of small ord
 er\n\nSpeaker:\n Steve Butler\n\nAffiliation:\n Iowa State University\n\nZ
 oom:\n Contact Sabrina Lato\n\nABSTRACT:\n\nA graph whose Laplacian matrix
  has a full set of eigenvectors with\nentries in {1\,-1} is said to be Had
 amard diagonalizable (i.e. there\nexists a Hadamard matrix which diagonali
 zes the Laplacian matrix). We\ndemonstrate that the only diagonalizable gr
 aphs on n=8k+4 vertices are\nK_n and K_{n/2\,n/2}.\n 
DTSTAMP:20250525T011016Z
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