John
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 Jul3 awarded Notable Question Jul2 awarded Curious Apr29 awarded Yearling Sep13 asked How to find a homeomorphism $\mathbb{R}^{n}\rightarrow\mathbb{R}^{n}$ having certain properties Sep12 comment Typo or additional hypotheses needed in problem 5, p.71 of Bredon's Topology and Geometry? I edited the question. It may be possible that the map you define is not an isomorphism after all. Sep12 revised Typo or additional hypotheses needed in problem 5, p.71 of Bredon's Topology and Geometry? Possible counterexample found Aug31 accepted Is there a cantor set in $\mathbb{R}^{n}-\{0\}$ which intersects every ray from the origin? Aug31 revised Is there a cantor set in $\mathbb{R}^{n}-\{0\}$ which intersects every ray from the origin? Title change Aug30 comment Is there a cantor set in $\mathbb{R}^{n}-\{0\}$ which intersects every ray from the origin? Very elegant, +1! Aug30 revised Is there a cantor set in $\mathbb{R}^{n}-\{0\}$ which intersects every ray from the origin? Examples incorrect Aug30 comment Is there a cantor set in $\mathbb{R}^{n}-\{0\}$ which intersects every ray from the origin? Yes, you are absolutely right. I edited the question. Aug30 asked Is there a cantor set in $\mathbb{R}^{n}-\{0\}$ which intersects every ray from the origin? Aug30 revised is $\{(x,y) : x,y \in \mathbb{Z} \}$ a closed set? Typo corrected Aug30 revised is $\{(x,y) : x,y \in \mathbb{Z} \}$ a closed set? Typo corrected Aug30 answered is $\{(x,y) : x,y \in \mathbb{Z} \}$ a closed set? Aug28 awarded Nice Answer Aug27 accepted A functional structure on the graph of the absolute value function Aug27 comment A functional structure on the graph of the absolute value function I think I follow, but just in case, could you clarify what you mean when saying "Lipschitz at $(0,0)$". Aug27 revised “Coordinate functions” on the structure-sheaf definition of a smooth manifold Added links Aug27 comment “Coordinate functions” on the structure-sheaf definition of a smooth manifold No problem. I edited the question and added some links to questions related to the problems of the section you are reading. I am myself stuck on problem 5 p.71 (see the last link I added at the end of my answer)