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Aug 13, 2010 at 19:28 comment added Tom Goodwillie It's not clear to me what I was looking for. Poincare Lemma means various things, some of which are true in characteristic zero alg geometry. I had forgotten about the Cartier isomorphism. I used to ponder that way back in the early days of cyclic homology.
Aug 9, 2010 at 8:56 comment added Kevin H. Lin Great! Thanks for the clarification, Dan.
Aug 9, 2010 at 6:53 comment added Simon Pepin Lehalleur There is a short lecture series (2007 Arizona winter school) by Kedlaya where he explains this char. p phenomenon carefully and makes the necessary corrections to get to Monsky-Washnitzer cohomology, with applications to the computation of zeta functions over finite fields : video : google.fr/search?tbs=vid%3A1&q=kedlaya+p-adic+cohomology lecture notes (although do not cover exactly the same ground) : swc.math.arizona.edu/aws/07/KedlayaNotes11Mar.pdf
Aug 8, 2010 at 21:48 history answered Daniel Pomerleano CC BY-SA 2.5