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Four closed characteristics on compact star-shaped hypersurfaces in $\mathbb{R}^{8}$
In this paper, we proved that for every non-degenerate $C^3$ compact
star-shaped hypersurface $\Sigma$ in $\mathbb{R}^{8}$ which carries no prime
closed characteristic of Maslov-type index $-1$, there exist at least four
prime closed characteristics on $\Sigma$.
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