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DTSTART:20170312T070000
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DTSTART;TZID=America/Toronto:20171116T153000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20171116T153000
URL:https://uwaterloo.ca/pure-mathematics/events/universal-algebra-seminar-
 20
SUMMARY:Universal Algebra Seminar
CLASS:PUBLIC
DESCRIPTION:RENZHI SONG\, DEPARTMENT OF PURE MATHEMATICS\, UNIVERSITY OF W
 ATERLOO\n\n\"Series parallel posets and polymorphisms\, part 2\"\n\nIn thi
 s two part series I will talk about the poset retraction problem\non the c
 lass of series parallel posets. Having classified those\nseries-parallel p
 osets whose retraction problem can be solved in\npolynomial time\, I will 
 now show that these same posets admit what is\nknown as SD-join polymorphi
 sms. Equivalently\, their retraction\nproblems are in nondeterministic log
  space.\n\nMC 5413
DTSTAMP:20260607T112045Z
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