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Jul 26, 2023 at 17:50 comment added Ryan Budney @JoshLackman: I have not looked in an algebraic topology textbook in some time. That said, I think you've found yourself a pretty textbook problem, if you were to write one.
Jul 26, 2023 at 5:49 comment added Josh Lackman @RyanBudney Thanks for your initial comment. If you do find this problem in a textbook I would be interested in knowing which one.
Jul 26, 2023 at 4:50 comment added Josh Lackman @DaveBenson This is a nice answer, thank you.
Jul 25, 2023 at 20:29 comment added Ryan Budney Probably the same book where this problem is a homework problem. :)
Jul 25, 2023 at 8:48 history edited Dave Benson CC BY-SA 4.0
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Jul 25, 2023 at 8:43 comment added Dave Benson The lemma must be in a book somewhere, but I don't know where.
Jul 25, 2023 at 8:39 history answered Dave Benson CC BY-SA 4.0