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Dec 22, 2012 at 0:56 answer added Jeremy Brazas timeline score: 4
Dec 21, 2012 at 19:51 answer added Henry T. Horton timeline score: 4
Dec 21, 2012 at 18:18 comment added Misha Also: Try to search "wedge sum" on MO; the first hit you see will get you started on the problem regardless of its origin.
Dec 21, 2012 at 18:06 comment added Misha @Pedro: If this is a homework, then MO is not an appropriate place for the question, try math.stackexchange instead. If this is not a homework, you should give a motivation for the question, explain why do you think the space is not contractible, what did you try to solve this problem, etc.
Dec 21, 2012 at 15:46 history asked Pedro Perez CC BY-SA 3.0