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DTSTART:20170312T070000
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DTSTART:20161106T060000
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DTSTART;TZID=America/Toronto:20170418T153000
SEQUENCE:0
TRANSP:TRANSPARENT
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URL:https://uwaterloo.ca/pure-mathematics/events/computability-learning-sem
 inar-67
SUMMARY:Computability Learning Seminar
CLASS:PUBLIC
DESCRIPTION:JONNY STEPHENSON\, DEPARTMENT OF PURE MATHEMATICS\, UNIVERSITY 
 OF\nWATERLOO\n\n\"Sets which are not the spectrum of any structure\"\n\nWe
  continue our analysis of spectra\, and show that no spectrum can be\nthe 
 Turing-upward closure of an F_sigma family of reals\, unless that \nupwar
 d closure is already an enumeration upper cone. We will see that\,\nas in 
 the case of the \"no two cones\" theorem\, the key to the proof is\nto con
 struct a suitably generic copy of a structure to see that it\ncannot possi
 bly have the indicated spectrum.\n\nMC 5403
DTSTAMP:20260607T075303Z
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