What does the following notation mean: $ x \in [-1, 1]^{N}$ ? Does it mean that $x$ is either 1 or -1 ?
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It means that $x$ is a sequence of $N$ elements, each of which lies in the interval $[-1, 1]$. – L. F. Sep 06 '22 at 03:11
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1Ordinarily this would mean that $x=(x_1,x_2,\ldots,x_N)$ where each $x_i \in [1,1]$. That is, $x$ is a member of the $N$ dimensional hyper cube centered at $0$ where each side length is $2$. – User8128 Sep 06 '22 at 03:11
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It's difficult to impossible to be sure what it means without any context. Could you add the context to the question? – Suzu Hirose Sep 06 '22 at 03:15