Odpowiedzi na post #126

I don't know if there's a good suitable book for your predicament, but I've found the Math Sorceror's recommendations palatable.

I recall this book mentioned previously in this thread had a good DE section: I still have the pdf in my textbook collection, so I can DM it to...

If you're talking about ODEs, Arnold's ODE book is pretty good IMO. Not what I learned out of back in the day, but what I wish they had taught out...