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[tex]f(x,\dot x,\ddot x,t)=0[/tex]

and let's suppose that f satisfies all the conditions of the Cauchy Theorem, i.e. f is such that the equation above with the initial conditions

[tex]x(t_0)=x_0\qquad\dot x(t_0)=v_0[/tex]

has an unique solution in a certain neighbourhood of t_0, for every t_0.

My question is, if instead of the two initial conditions above I have an initial and a final condition

[tex]x(t_0)=x_0\qquad x(t_1)=x_1[/tex]

under what further conditions on f the solution exists for all x_0 and x_1?