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DTSTART:20120311T070000
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DTSTART;TZID=America/Toronto:20120711T154000
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URL:https://uwaterloo.ca/pure-mathematics/events/computability-learning-sem
 inar-knolls-jul-11-2012
LOCATION:MC - Mathematics & Computer Building 200 University Avenue West 50
 46 Waterloo ON N2L 3G1 Canada
SUMMARY:Computability learning seminar
CLASS:PUBLIC
DESCRIPTION:CARRIE KNOLLS\, PURE MATHEMATICS DEPARTMENT\, UNIVERSITY OF WAT
 ERLOO\n\n\"BACK AND FORTH RELATIONS - PART II\"\n\nWe will prove that\, fo
 r all countable ordinals β\, there is a natural\nconnection between the b
 ack-and-forth relation ≤β and the Πβ and\nΣβ formulas. This result 
 suggests that\, in general\, it is difficult\nto “compute” the relatio
 ns ≤β. For practical purposes\, we would\nlike to consider structures w
 here the back-and-forth relations are\nc.e.
DTSTAMP:20260605T005435Z
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