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St. Petersburg Mathematical Journal
St. Petersburg Mathematical Journal
ISSN 1547-7371(online) ISSN 1061-0022(print)

 

On Tabachnikov's conjecture


Authors: A. I. Nazarov and F. V. Petrov
Translated by: A. I. Nazarov
Original publication: Algebra i Analiz, tom 19 (2007), nomer 1.
Journal: St. Petersburg Math. J. 19 (2008), 125-135
MSC (2000): Primary 53A04; Secondary 52A40, 52A10
Published electronically: December 17, 2007
MathSciNet review: 2319514
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Abstract | References | Similar Articles | Additional Information

Abstract: Tabachnikov's conjecture is proved: for any closed curve $ \Gamma$ lying inside a convex closed curve $ \Gamma_1$ the mean absolute curvature $ T(\Gamma)$ exceeds $ T(\Gamma_1)$ if $ \Gamma\ne k\Gamma_1$.


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Additional Information

A. I. Nazarov
Affiliation: Department of Mathematics and Mechanics, St. Petersburg State University, Universitetskiĭ Pr. 28, Staryĭ Peterhof, St. Petersburg 198504, Russia
Email: an@AN4751.spb.edu

F. V. Petrov
Affiliation: St. Petersburg Branch, Steklov Mathematical Institute, Russian Academy of Sciences, Fontanka 27, St. Petersburg 191023, Russia
Email: fedorpetrov@mail.ru

DOI: http://dx.doi.org/10.1090/S1061-0022-07-00989-2
PII: S 1061-0022(07)00989-2
Keywords: Geometric inequalities, mean absolute curvature, convexity
Received by editor(s): August 1, 2006
Published electronically: December 17, 2007
Additional Notes: Supported by grant NSh-8336.2006.1 (the first author) and by grants NSh-2251.2003.1 and RFFR 05-01-00899 (the second author)
Dedicated: To V. A. Zalgaller on the occasion of his 85th birthday with love and great respect
Article copyright: © Copyright 2007 American Mathematical Society