x-nullclines

The -nullclines are found by setting the RHS of the first ODE equal to 0:

> factor( rhs(ode1) ) = 0 ;

The -nullcline(s) typically consists of curves that can be expressed either as a function of or as a function of :

> xNULL1 := plot( 2-x, x = -1 .. 6, color=GREEN ): # for a nullcline of the form y=F(x)

> xNULL2 := plot( [ 0, y, y = -5 .. 5 ], color=GREEN ): # for a nullcline of the form x=G(y)

> xNULLplot := display( [ xNULL1, xNULL2 ], axes=BOXED ):

> xNULLplot;

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