beg stable henceforward we state that our pary syste is dynaically stable if no close enunter happens durg the age of our sor syste， about ±5 gyr cidentally， this defition ay be repced by onewhich an ourrence of any orbital crossg beeen either of a pair of ps takes pce this is becae we know fro experience that an orbital crossg is very likely to lead to a close enunterpary and proary systes (yoshaga， kokubo ≈ap;ap;ap; ako 1999) of urse this statent cannot be siply applied to systes with stable orbital resonances such as the neptune–pto syste
12previo studies and ais of this research
addition to the vagueness of the ncept of stability， the psour sor syste show a character typical of dynaical chaos (ssan ≈ap;ap;ap; wisdo 1988， 1992) the cae of this chaotic behaviour is now pa
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