Βιογραφικό

  1. At the beginning of the Introduction it should be added that the covering numbers make sense for non-compact metric spaces , as well, but then they can be infinite. Thus, we do not need to examine the compactness of the metric spaces B, A,…. .
  2. In the proof of Proposition 2.1 it could be added that for the function f(z)=z the result obviously holds. Thus, we consider that there exists k>1 such that a_k is non zero. In this way some inequalities are strict and the proof works. Otherwise, in the case where the sum of k|a_k| for k>1 is exactly equal to 1 the proof does not work. But in this case automatically there is k>1 such that a_k is non zero. So there is no mistake, but something should be added as explanation.

Note: I guess Proposition 2.1 is well known. So a reference could probably replace its proof.