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A Review of the Index Method in Closed Geodesic Problem

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Abstract

In this paper we review and systematize the index method in closed geodesic problem. As we know, the closed geodesic problem on compact Riemannian or Finsler manifold is a famous problem, and has far from been resolved. In recent years, the Maslov-type index theory for symplectic path has been applied to studying the closed geodesic problem, and has induced a great number of results on the multiplicity and stability of closed geodesics. We will systematically introduce these progresses in this review.

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Acknowledgements

We would like to sincerely thank the referees for their careful reading and valuable comments and suggestions on this paper. We would like to sincerely thank our advisor, Professor Yiming Long, for introducing us to the theory of closed geodesics and for his valuable help and encouragement to us in all ways.

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Correspondence to Wei Wang.

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The first author is supported by Nankai Zhide Foundation, the second author is supported by NSFC (Grant Nos. 12025101, 11431001)

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Liu, S., Wang, W. A Review of the Index Method in Closed Geodesic Problem. Acta. Math. Sin.-English Ser. 38, 85–96 (2022). https://doi.org/10.1007/s10114-022-0256-x

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