Learn discrete calculus from Knuth's Concrete Mathematics first; it is combinatorics-heavy and once you get to differences and summation per-partes, you can qui

Learn discrete calculus from Knuth's Concrete Mathematics first; it is combinatorics-heavy and once you get to differences and summation per-partes, you can quickly extend it to "normal" calculus as you master notion of "limit". Quick look at it e.g. here: http://homepages.math.uic.edu/~kauffman/DCalc.pdf http://homepages.math.uic.edu/~kauffman/DCalc.pdf