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10 Dimension[0YH]

Let \((X,d)\) be a metric space. Let in the following \(K\) a compact non-empty subset of \(X\), and \(N(𝜌)\) the minimum number of balls of radius \(𝜌\) that are needed to cover \(K\).  1

Definition 171

[0YJ]

If the limit does not exist, we can still use the limsup and the liminf to define the upper and lower dimension.

Note that this definition depends a priori on the choice of the distance, i.e. \(N=N(𝜌,K,d)\) and \(\dim =\dim (K,d)\). See in particular [0YZ].

E171

[0YK]

E171

[0YN]

E171

[0YQ]

E171

[0YS]

E171

[0YV]

E171

[0YX]

E171

[0YZ]

E171

[0Z1]

E171

[0Z3]

E171

[0Z7]

E171

[0ZB]

E171

[0ZD]

E171

[0ZG]

E171

[0ZJ]

E171

[0ZM]

E171

[0ZP]

E171

[0ZR]

QuasiEsercizio 1

[0ZS]

  1. By the Heine–Borel theorem [0V3] we know that \(N(𝜌){\lt}∞\)
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