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SUMMARY:Edward Poon (ERAU)
DTSTART:20220322T180000Z
DTEND:20220322T190000Z
DTSTAMP:20260423T005818Z
UID:WMGAG/16
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/WMGAG/16/">M
 atrices with circular higher rank numerical range</a>\nby Edward Poon (ERA
 U) as part of GAG seminar\n\nLecture held in Boswell Hall 203.\n\nAbstract
 \nThe rank-$k$ numerical range of a square matrix $A$ is the set of all co
 mplex numbers $c$ such that $PAP = cP$ for some rank-$k$ orthogonal projec
 tion $P$. (When $k=1$\, this reduces to the classical numerical range.)  W
 e investigate conditions on when the rank-k numerical range is a circular 
 disk. \n This talk is based on joint work with Ilya Spitkovsky and Hugo Wo
 erdeman.\n
LOCATION:https://researchseminars.org/talk/WMGAG/16/
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