Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-27T21:07:40.831Z Has data issue: false hasContentIssue false

A counterexample in parabolic potential theory

Published online by Cambridge University Press:  26 February 2010

Pawel Kröger
Affiliation:
Mathematisches Institut, Bismarchstr. 1 1/2, 91054 Erlangen, Germany.
Get access

Extract

In Section 1 of this note we will construct an example of a subset of R × Rn such that the parabolic capacity with respect to the heat equation is zero although its orthogonal projection onto {0} × Rn is the whole space. Such examples were already given by R. Kaufman and J.-M. Wu in [5] and [6]. However, our probabilistic approach seems to be more transparent since it does not depend on explicit formulas for Green functions.

MSC classification

Type
Research Article
Copyright
Copyright © University College London 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.Deny, J.. Un theoreme sur les ensembles effilés. Ann. Univ. Grenoble Sect. Sci. Math. Phys., 23 (1948), 139142.Google Scholar
2.Doob, J. L.. Classical potential theory and its probabilistic counter part (Springer: New York, 1984).Google Scholar
3.Friedman, A.. Partial differential equations of parabolic type (Prentice Hall: Englewood Cliffs, N.J., 1964).Google Scholar
4.Harris, Th. E.. The theory of branching process (Springer: Berlin, 1963).Google Scholar
5.Kaufman, R. and Wu, J. M.. Singularity of parabolic measures. Comp. Math., 40 (1980), 243250.Google Scholar
6.Kaufman, R. and Wu, J. M.. Parabolic potential theory. J. Diff. Eq., 43 (1982) 204234.Google Scholar
7.Stroock, D. W. and Varadhan, S. R. S.. Multidimensional diffusion processes (Springer: Berlin, 1979).Google Scholar
8.Watson, N. A.. Thinness and boundary behaviour of potentials for the heat equation. Mathematika, 32 (1985) 9095.Google Scholar