GREATEST common factor
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The answer is 2=E 1=f 7=G 8=H.
Math is an abbreviation of mathematics: it is not an acronym. So the h does not stand for anything!
lim as h->0 of (f(x+h) - f(x))/h or lim as x->a of (f(x) - f(a))/(x - a)
Yes, h(x) is simply a function h --> x, like f(x) is a function f --> x. The different letters are used to illustrate the fact that the two functions need not be the same.