question of whether our sor syste is stable or not this is partly a result of the fact that the defition of the ter ‘stability’ is vague when it is edretion to the proble of pary otionthe sor syste actually it is not easy to give a clear， rigoro and physically angful defition of the stability of our sor syste
aong any defitions of stability， here we adopt the hill defition (gdan 1993): actually this is not a defition of stability， but of stability we defe a syste as beg unstable when a close enunter ours sowherethe syste， startg fro a certa itial nfiguration (chabers， wetherill ≈ap;ap;ap; boss 1996; ito ≈ap;ap;ap; tanikawa 1999) a syste is defed as experiencg a close enunter when o bodies approach one another with an area of the rger hill radi otherwise the syste is defed as
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