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SUMMARY:Mario Ullrich (Johannes Kepler University Linz)
DTSTART:20261105T094000Z
DTEND:20261105T104000Z
DTSTAMP:20261109T050829Z
UID:FunctionSpaces/123
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/FunctionSpac
 es/123/">Inequalities between s-numbers and n-width</a>\nby Mario Ullrich 
 (Johannes Kepler University Linz) as part of Function spaces\n\n\nAbstract
 \nWe prove that all s-numbers can be bounded by each other with a factor\n
 $e(n+1)$. This is sharp up to the constant and settles conjectures of\nMit
 yagin\, Henkin\, Carl and Pietsch dating back to 1963. We also extend\nit 
 to widths of convex sets and discuss optimality there\, as well as\napplic
 ations to the adaption problem in information-based complexity.\n
LOCATION:https://researchseminars.org/talk/FunctionSpaces/123/
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