When I was in college I supplemented my learning with Notes on Diffyqs, which I thought explained things much clearer and concisely than my assigned textbook. I

When I was in college I supplemented my learning with Notes on Diffyqs, which I thought explained things much clearer and concisely than my assigned textbook. It is available for free and has tools for modeling systems in Octave/Matlab. https://www.jirka.org/diffyqs/ https://www.jirka.org/diffyqs/