I have problems trying to find a diffeomorphism of $A\times (0,1)$ with $S$, how could this be done? I think that if this is done, the question in (b) would be easy. Could anyone help me, please? Thank you very much.
2026-03-26 13:02:44.1774530164
Let $A$ be ans open rectificable set in $\mathbb{R}^{n-1}$. Given the point $p$ in $\mathbb{R}^n$ with $p_n>0$, let $S$ be the subset of
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