It is shown that for an area preserving twist map on cylinder the phase space is foliated by invariant circles not null-homotopic if and only if Jacobi fields do not have conjugate points.
机构:
Tsing Hua Univ, Dept Math Sci, Uncertainty Theory Lab, Beijing 100084, Peoples R ChinaTsing Hua Univ, Dept Math Sci, Uncertainty Theory Lab, Beijing 100084, Peoples R China
Li, Xiang
Liu, Baoding
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机构:
Tsing Hua Univ, Dept Math Sci, Uncertainty Theory Lab, Beijing 100084, Peoples R ChinaTsing Hua Univ, Dept Math Sci, Uncertainty Theory Lab, Beijing 100084, Peoples R China