I was studying an example of the Alexander Horned Sphere on page 171 of Allen Hatcher's book. The example computes the fundamental group $\pi_1(\mathbb R^{3}-B)$ of the complement of the sphere in $\mathbb R^{3}$, which I found that very difficult to understand. Could anyone please suggest me some materials other than Allen Hatcher's to understand that example?
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2$\begingroup$ Rolfsen's book Knots and Links has a sequence of exercises that show $\pi_1(\mathbb{R}^3 - B)$ isn't finitely generated. I'm not sure it's all that different from Hatcher's description though. $\endgroup$– Eric S.Feb 17, 2016 at 4:14
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3$\begingroup$ Crossposted on MSE. Please don't do that. $\endgroup$– Michael AlbaneseFeb 17, 2016 at 4:36
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$\begingroup$ Sorry. I will delete the post on stackexchange. $\endgroup$– DeepleeqeFeb 17, 2016 at 4:47
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