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 P: 330 Limit definition: Let f(x)be defined for all x in some open interval containing the number a, with the possible exception that f(x) need not be defined at a. We will write $$\lim_{x \rightarrow a}f(x)=L$$ if given any number epsilon > 0 we can find a number delta > 0 such that |f(x) - L| < epsilon if 0 < |x - a| < delta. If L plays the role of epsilon in the definition above, what plays the role of |f(x) - L|. I just do not get it yet. Thanks.