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user 36563
6
votes
Accepted
Compactness of a semi algebraic set
Let $p \in \mathbb{R}[x_1, \ldots, x_n]$. The set $S=\{x \in \mathbb{R}^n: p(x) \geq 0\}$ is compact if and only if there is a natural number $N$ and polynomials $g_i, h_i \in \mathbb{R}[x_1, \ldots, …
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