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Oct 17, 2014 at 21:49 comment added Jacob Lurie Let I be the fiber of the map A -> B. Then the fiber of the map A -> Tot^n is the (n+1)st smash power of I over A. For these fibers to vanish in the limit, it suffices that they are getting more connected. Since A is connective, it suffices for I to be connected, which is immediate from your hypothesis.
Oct 17, 2014 at 21:46 vote accept Jonathan Beardsley
Oct 17, 2014 at 21:45 comment added Jonathan Beardsley Jacob have you (or anyone else) written down somewhere a proof that it's true under the conditions (on $\pi_0$ and $\pi_1$) that Carlsson gives?
Oct 17, 2014 at 21:36 comment added Jonathan Beardsley Fair enough. I'll rephrase the question.
Oct 17, 2014 at 21:33 history answered Jacob Lurie CC BY-SA 3.0