Recent content by huishui

thanks i think my question is my understand on least action and lagrangian not deeply enough, would you give me some suggest?

L.D.Landau's book <Mechanics> first page have below word: if all the co-ordinates and velocities are simultneously specified,it is known from experience that the state of system is completely determined and that its subsequent motion can,in principle,can be calculated.Mathematically,this means...