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May 31 at 11:39 history edited Todd Trimble CC BY-SA 4.0
corrected the penultimate paragraph
Sep 3, 2010 at 11:10 comment added Todd Trimble Oh duh. That's what I should have said there. Thanks, Mike.
Sep 3, 2010 at 7:08 comment added Mike Shulman A slightly more general situation under which Coalg(FU) and Alg(UF) are equivalent is when the adjunction is idempotent: ncatlab.org/nlab/show/idempotent%20adjunction. This is always the case whenever C and D are posets, although U or F need not be fully faithful in such a case.
Aug 27, 2010 at 13:56 vote accept Gerrit Begher
Aug 26, 2010 at 17:41 history edited Todd Trimble CC BY-SA 2.5
added 875 characters in body
Aug 26, 2010 at 15:59 history answered Todd Trimble CC BY-SA 2.5