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Twist points of the von Koch snowflake

Authors: Fausto Di Biase, Bert Fischer and Rüdiger L. Urbanke
Journal: Proc. Amer. Math. Soc. 126 (1998), 1487-1490
MSC (1991): Primary 31A15, 30C35
MathSciNet review: 1443822
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Abstract: It is known that the set of twist points in the boundary of the von Koch snowflake domain has full harmonic measure. We provide a new, simple proof, based on the doubling property of the harmonic measure, and on the existence of an equivalent measure, invariant and ergodic with respect to the shift.

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Additional Information

Fausto Di Biase
Affiliation: Department of Mathematics, Princeton University, Princeton, New Jersey 08544

Bert Fischer

Rüdiger L. Urbanke
Affiliation: Room 2C-254, Bell Labs, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974

Keywords: Harmonic measure, von Koch snowflake, doubling property, shift, ergodicity, twist points
Received by editor(s): November 1, 1996
Additional Notes: The first author was supported by CNR Grants 203.01.55 and 203.01.63.
The second author was partially supported by the Alexander von Humboldt Foundation.
Communicated by: Albert Baernstein II
Article copyright: © Copyright 1998 American Mathematical Society