...is like accounting. Is more abstracting of the brain than calculus. What's missing from it are the visualizations of what is being mentioned. Like working with a space in the mind that can only make one or two changes at a time - giving logic but not seeing the big picture. Unless the big picture is really only those one or two changes in the symbology and equalities. But these only tell relations of 1-2 changes connecting and spreading like a web.