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. The flat central configurations of four planet motions is considered by using Wu Elimination (the Char-set method) in this paper. We obtain 12 collinear central configurations. Obtain a necessary condition for determining flat but non-collinear central configurations. And deduce that in general there are finitely many,flat central configurations determined by their masses and their angular velocity. Key Words: Central Configuration, Wu Elimination

Flat central configurations of four planet motions