Differential Equations

[bshoring]

I've always enjoyed the articles by Valentin Albillo. One of my favorites was his "Long Live the HP-25 !" In that article he gave two examples of programs to Solve Differential Equations which demonstrate just how powerful the HP-25 could be with its 49 program steps.

I have entered those programs into my 25C emulator and the programs work perfectly.

There's just one problem. As a retired financial guy, I don't understand what Differential Equations are or what they are supposed to do. I've googled them and have watched some online videos, but I still can't quite get my arms around what Differential Equations are.

Does anyone here know if a resource I can go to in order to understand them?

Thanks.