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Permanence of metric fractals

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Author(s): Kyril Tintarev

Journal: Electronic Journal of Differential Equations
ISSN 1072-6691

Volume: Conference;
Issue: 16;
Start page: 185;
Date: 2007;
Original page

Keywords: Fractals | Sobolev spaces | Dirichlet forms | homogeneous spaces.

ABSTRACT
The paper studies energy functionals on quasimetric spaces, defined by quadratic measure-valued Lagrangeans. This general model of medium, known as metric fractals, includes nested fractals and sub-Riemannian manifolds. In particular, the quadratic form of the Lagrangean satisfies Sobolev inequalities with the critical exponent determined by the (quasimetric) homogeneous dimension, which is also involved in the asymptotic distribution of the form's eigenvalues. This paper verifies that the axioms of the metric fractal are preserved by space products, leading thus to examples of non-differentiable media of arbitrary intrinsic dimension.

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