Phase plane analysis

Python scripts supporting tutorials on phase plane analysis. For more details, see these blog posts:

• Using phase plane analysis to understand dynamical systems
• The Van der Pol oscillator
• FitzHugh-Nagumo model

For reproducibility:

conda create -n phaseplane -y python=3.11
conda activate phaseplane
conda install -y mamba
mamba install -y ipykernel numpy matplotlib scipy