could someone please help me on the following exercise:
Let $P ⊂ \mathbb{R}^n$ a polyhedron and $v$ a vertex of $P$. Show: $\textrm{dim}(N_P(v))=n$
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What approaches have you tried to solving this problem? Also, are there any extra assumptions on $P$? – Zim Jun 16 '20 at 16:00