| http://www.w3.org/ns/prov#value | - For example, none of the several texts on calculus written by Tom Apostol, accept anything less than the sort of definition I would require: for a real function, f, defined on an open set containing 0 to be continuous at zero, it is necessary that (1) the function must have a value, f(0), at zero. (2) the function must have a finite limit as x increases to 0. (2) the function must hav
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