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Find initial condition such that ODE solution is periodic

by TomAlso
Tags: condition, initial, periodic, solution
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Mar16-12, 08:16 PM
P: 5
I have the following ODE system

x' = v \\
v' = v - \frac{v^3}{3} - x \\
x(0) = x_0 \\
v(0) = 0

I am asked to find [itex]x_0>0[/itex] such that the solution [itex](x(t),v(t))[/itex] is periodic. Also, I need to find the period [itex]T[/itex] of such solution.

I don't know how to solve the system in the first place (or if it is even possible), so is there a way to figure out what [itex]x_0>0[/itex] will give a periodic solution without solving the system? Thanks!
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