Multiplicity of closed characteristics on $P$-symmetric compact convex hypersurfaces in ${\mathbb{R}}^{2n}$

Lei Liu, Li Wu

There is a long standing conjecture that there are at least $n$ closed characteristics for any compact convex hypersurface $\Sigma$ in ${\mathbb{R}}^{2n}$, and the symmetric case, i.e. $Σ…