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This paper describes, analyzes, and explains a novel twisting phenomenon which occurs in a triaxial rigid body (such as a tennis racket) when it is rotating about an axis initially near its unstable intermediate principal axis.

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Ashbaugh, M.S., Chicone, C.C. & Cushman, R.H. The twisting tennis racket. J Dyn Diff Equat 3, 67–85 (1991).

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1980 AMS(MOS) mathematics subject classifications