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May 24, 2017 at 18:30 comment added Maffred Thank you so much! I got the intuition but could I ask more in depth explaination? Let $x \in X_R$, $x \in Y \cap U \subset U$. How should we use the hypothesis to deduce that there is a open ball centered in $x$ such that the intersection with $Y \cap U$ is like $\mathbb R^n$ in $\mathbb C^n$?
May 24, 2017 at 13:27 history answered David E Speyer CC BY-SA 3.0