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Lower S-Dimension of Fractal Sets

The interrelations between (upper and lower) Minkowski contents and (upper and lower) surface area based contents (S-contents) as well as between their associated dimensions have recently been investigated for general sets in R^d (cf. [3]). While the upper dimensions always coincide and the upper contents are bounded by each other, the bounds obtained in [3] suggest that there is much more flexibility for the lower contents and dimensions. We show that this is indeed the case. There are sets whose lower S-dimension is strictly smaller than their lower Minkowski dimension. More precisely, given two numbers s, m with 0 < s < m < 1, we construct sets in R^d with lower S-dimension s+d-1 and lower Minkowski dimension m+d-1. In particular, these sets are used to demonstrate that the inequalities obtained in [3] regarding the general relation of these two dimensions are best possible.