>>10898336Another thing is that I actually DO understand the method of characteristics in an analytical manner, however I don't get the geometrical reasoning behind it. It's relatively easy to understand how a change of variables makes things easier, but I can't wrap my head around the geometrical aspect of it. I'm talking about the material in this book
https://www.jirka.org/diffyqs/diffyqs.pdfIt starts at page 72.
