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Nov 19, 2010 at 12:26 vote accept Jeff Strom
Nov 19, 2010 at 11:24 comment added Allen Hatcher A textbook reference for this argument is Example 4L.7 on page 495 of my Algebraic Topology book.
Nov 19, 2010 at 8:24 history answered Neil Strickland CC BY-SA 2.5