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SUMMARY:Clara Löh (University Regensburg)
DTSTART:20221128T130000Z
DTEND:20221128T140000Z
DTSTAMP:20260423T004820Z
UID:CTA/88
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CTA/88/">$L^
 2$-Betti numbers and computability of reals</a>\nby Clara Löh (University
  Regensburg) as part of Computability theory and applications\n\n\nAbstrac
 t\nFor several real-valued invariants from topology or group theory\, the 
 individual values are not arbitray real numbers\, but (right-)computable r
 eals. For example\, the real numbers arising as $L^2$-Betti numbers of gro
 ups are right-computable\, where the right-computability degree is bounded
  by the Turing degree of the word problem. \n\nI will give an overview of 
 such results on $L^2$-Betti numbers and related invariants. This talk is b
 ased on joint work with Matthias Uschold.\n
LOCATION:https://researchseminars.org/talk/CTA/88/
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