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Lagrangian Mechanics is the reformulation of Newtonian Mechanics that utilizes the Lagrangian defined by L=T-U where T= total kinetic energy of a system of particles U= sum of the [potential energy] functions of a system of particles In other branches of physics, the Lagrangian is defined as the function L: TQ--> R Where Q is the [configuration] space, a subset of R^3N such that the action, defined as the functional, A(q)= int(L) dt when it reaches stationary value at {q(t)}, will male {q(t)} the equations of motion. Note, int() means the integration notation with the limits of integration being positive an negative infinity, respectively. It is shown, using the Calculus of Variations, that the equations of motion are in such a way that they satisfy the Lagrange's Equations of motion D(d(L)/dv)-d(L)/dq=0 Where D is the differential operator with respect to time, d/dx stands for partial [differentiation], and v is the generalized velocity.
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