Give the definition of a Lyapunov function. Consider the differential equation d dt x(t) = ax+y=x√√x² + y² d dt y(t) = =ay-x-y√√√x²+ y², First, multiply yx and xy to show that the origin is the only equilibrium. Then, determine the local stability of the origin as a function of the model parameter a. Next, determine which values of a the function V(x,y) = x² + y² is a Lyapunov function. Finally, for a > 0, write the differential equation in polar co-ordinates and show that there is a stable limit cycle.

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