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A quick guide to sketching phase planes

A quick guide to sketching phase planesSection of the text discusses equilibrium points and analysis of the phase plane. However,there is one idea, not mentioned in the book, that is very useful to sketching and analyzing phaseplanes, namelynullclines. Recall the basic setup for an autonomous system of two DEs:dxdt=f(x, y)dydt=g(x, y)To sketch the phase plane of such a system, at each point(x0, y0)in thexy-plane, we draw a vectorstarting at(x0, y0)in the directionf(x0, y0)i+g(x0, y0) of a set of points in the phase plane so thatdxdt= , these are the points where the vectors are either straight up or straight down. Alge-braically, we find thex-nullcline by solvingf(x, y) = a set of points in the phase plane so thatdydt= 0.

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