dy/dt = r(1-y/K)y - Ey
r, K, and E are constants.
This is a logistic model of fish population.
a) Show that if E < r, then there are two equilibrium points y1 = 0
and y2 = K(1 - E/r) > 0
b) Show that y = y1 is unstable and y = y2 is asymptotically stable.
c)A sustainable yield Y of the fisher is a rate at which fish can be caught
indefinitely. It is the product of the effort E and the asymptotically stable
population y2. Find Y as a function of the effort E.
d) Determine E so as to maximize Y and thereby find the maximum sustainable yield Ym.
Any hints of helps are appreciated. I'm having a real hard time with this .
Thanks in advance!!