Hi, I'm looking for a good introduction to existence and uniqueness of ordinary differential equations. Whenever I search for anything I get some really advanced looking stuff packed with topology and stuff. Is there anything a bit more basic that explains the ideas well without assuming too much prior knowledge?

In fact can someone also tell me what the essential prerequisites actually are for learning about this?

My engineering course doesn't touch on existence and uniqueness, but it's something I'd like to pick up on my own.

Thanks