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A priori estimates for solutions to equations of motion of an inextensible hanging string

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Abstract

We consider the initial boundary value problem to equations of motion of an inextensible hanging string of finite length under the action of the gravity. We also consider the problem in the case without any external forces. In this problem, the tension of the string is also an unknown quantity. It is determined as a unique solution to a two-point boundary value problem, which is derived from the inextensibility of the string together with the equation of motion, and degenerates linearly at the free end. We derive a priori estimates for solutions to the initial boundary value problem in weighted Sobolev spaces under a natural stability condition. The necessity for the weights results from the degeneracy of the tension. Uniqueness of solutions is also proved.

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Acknowledgements

T. I. is partially supported by JSPS KAKENHI Grant Number JP22H01133.

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  1. Department of Mathematics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan

    Tatsuo Iguchi & Masahiro Takayama

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  1. Tatsuo Iguchi
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  2. Masahiro Takayama
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Correspondence to Masahiro Takayama.

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Iguchi, T., Takayama, M. A priori estimates for solutions to equations of motion of an inextensible hanging string. Math. Ann. (2024). https://doi.org/10.1007/s00208-023-02786-5

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