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replaced http://mathoverflow.net/ with https://mathoverflow.net/

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edited Apr 13, 2017 at 12:58

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Since this question is about homotopical excision, I refer to my recent answer to

What is the intuition behind the Freudenthal suspension theorem?What is the intuition behind the Freudenthal suspension theorem?

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created Jan 7, 2012 at 22:31

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Since this question is about homotopical excision, I refer to my recent answer to

What is the intuition behind the Freudenthal suspension theorem?