BDH2-4.mws Getting started Example #1 Defining the model Direction Field, Phase Portrait, and Solution Curves (DEplot) Direction Field Phase Portrait Euler2 (a custom-defined procedure for two-dimensional systems) Example #2: Van der Pol equation Defining the model Direction Field, Phase Portrait, and Solution Curves (DEplot) Direction Field Phase Portrait Euler2 (a custom-defined procedure for two-dimensional systems)