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Jun 6, 2011 at 11:24 comment added Urs Schreiber Hi Sander, thanks, that's great. I should say that I had posted this here a bit before I got your reply yesterday. (I was desperate to get the answer ;-) So what I was missing was the bit about being able to discard the homotopy equivalence in the middle and thus seeing that the composite zig-zag-zig gives just the single zig that one is after. Very good, thanks for this.
Jun 6, 2011 at 11:20 vote accept Urs Schreiber
Jun 6, 2011 at 8:50 history answered skupers CC BY-SA 3.0