basic books for calculus :
* Larson, Ron, Bruce H. Edwards (2010). "Calculus", 9th ed., Brooks Cole Cengage Learning. ISBN 9780547167022
* McQuarrie, Donald A. (2003). Mathematical Methods for Scientists and Engineers, University Science Books. ISBN 9781891389245
* Stewart, James...
i didn't get you Mr. in limits we just approach a constant or a value closer than the closest possibility... this is the only concept of limits in my view...