I am currently using Jorge Sotomayor's "Lições de equações diferenciais ordinárias", in Portuguese. However, Portuguese is not my best language by a long shot, and I struggle a little. Is there an English edition of this book?
I have tried looking in different sites, with no luck. The only possible mention is in another thread:
Good book to study ODEs throgh geometric ideas
It's mentioned in the first comment with an English title:
- Jorge Sotomayor, Lessons of Ordinary Differential Equations, IMPA, 1979.
But I haven't been able to find it anywhere. The reason I need to use this book is because my college course follows it's material and it's presented a bit differently from the other books I have tried.