Description: Because of all the forces are decomposed into the x-axis direction and the y-axis direction of the force, the whole problem simplistic, were obtained by x-axis direction and the y-axis direction of the force of and to know that the pie track to be moved, and x-axis direction and the y-axis direction of the force should be the vector of the pie the direction of the gradient. All round cake on the formation of the gradient vector Grad U
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Grad U and moving rules.txt
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