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Mar 7, 2011 at 0:28 comment added Dan Ramras One can also use Van Kampen in this case to avoid cellular approximation; that's what Hatcher does. Cellular approximation is the natural thing to do, though.
Mar 6, 2011 at 20:05 comment added Hugo Chapdelaine Thanks Neil for the nice explanation. This cellular approximation theorem is what I was missing!
Mar 6, 2011 at 20:04 vote accept Hugo Chapdelaine
Mar 6, 2011 at 18:48 history answered Neil Strickland CC BY-SA 2.5