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Aug 12, 2014 at 12:02 comment added Russ Woodroofe Link to amazon webpage for Hilton and Wylie is here: amazon.com/Homology-Theory-Introduction-Algebraic-Topology/dp/…
Jul 4, 2010 at 1:39 comment added Jeff I see that this works, thanks a lot for all your help!
Jul 4, 2010 at 1:39 vote accept Jeff
Jul 3, 2010 at 23:06 comment added Jeff Hi, I am assuming you mean that the special point at which one can attach these two cones to get a noncontractible space is the limit point, 0. But it seems to me that any which way you attach these two spaces, you will get a contractible space. I believe this to be true because both cones are themselves contractible, and so I can contract one first, and then the other. It is because these cones are a subset of R^2 that I can contract one first, and then the other. For instance, this process works to contract the space shown on the cover of the book you suggested. Thanks for your response
Jul 3, 2010 at 22:30 history answered Allen Hatcher CC BY-SA 2.5