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Questions on the symbolic (DSolve, DifferentialRoot) and numerical (NDSolve) solutions of differential equations in Mathematica.

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I'm new to Mathematica, and I'm writing a math research paper and I need to generate a phase portrait of the following system of polar equations $\qquad \dot r=r(r-1)(r-2)$ $\qquad \dot \theta=1$ w …
asked Nov 23 '16 by AlteredReality