Consider the systemdx/dt = x(a x y), dy/dt = y(c +

Chapter 9, Problem 12

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Consider the systemdx/dt = x(a x y), dy/dt = y(c + x),where a, , , c, and are positive constants.(a) Find all critical points of the given system. How does their location change as increases from zero? Assume that a/ > c/, that is, < a/c. Why is this assumptionnecessary?(b) Determine the nature and stability characteristics of each critical point.(c) Show that there is a value of between zero and a/c where the critical point in theinterior of the first quadrant changes from a spiral point to a node.(d) Describe the effect on the two populations as increases from zero to a/c.

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