Yep, I've read through that a couple times now and for some reason it's just not "sticking" so-to-speak.
I want to abstract a lot of math into a simple library. The library itself will have one class and one or maybe two functions. Nothing fancy at this point. If I abstract that out, I can reduce the size of my sketch by 30%, and it would allow me to use it easily in other sketches (which I will have need for down the road).