# American Institute of Mathematical Sciences

July  2014, 34(7): 3013-3024. doi: 10.3934/dcds.2014.34.3013

## On the higher-order b-family equation and Euler equations on the circle

 1 Department of Mathematics, Nanjing Forestry University, Nanjing 210037, China

Received  June 2013 Revised  September 2013 Published  December 2013

Considered herein is a geometric investigation on the higher-order b-family equation describing exponential curves of the manifold of smooth orientation-preserving diffeomorphisms of the unit circle in the plane. It is shown that the higher-order $b-$family equation can only be realized as an Euler equation on the Lie group Diff$(\mathbb{S}^1)$ of all smooth and orientation preserving diffeomorphisms on the circle if the parameter $b=2$ which corresponds to the higher-order Camassa-Holm equation with the metric $H^k, k\ge 1.$
Citation: Min Zhu. On the higher-order b-family equation and Euler equations on the circle. Discrete & Continuous Dynamical Systems, 2014, 34 (7) : 3013-3024. doi: 10.3934/dcds.2014.34.3013
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