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- E5
[0YQ] Let \(N'(π)\) be the minimum number of balls, with radius \(π\) and centered in \(K\), that are necessary to cover \(K\): then
\[ N'(2π)β€ N(π)β€ N'(π)~ . \]
So the dimension does not change if you require the balls to be centered at points of \(K\).
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