The meaning of infinity in calculus and computer algebra systems. Beeson, M. & Wiedijk, F. Journal of Symbolic Computation, 39(5):523-538, 2005.  
Pdf  bibtex   @article{beeson2005-wiedijk,
	author = {Michael Beeson and Freek Wiedijk},
	date-added = {2014-11-13 23:11:09 +0000},
	date-modified = {2014-11-14 16:58:28 +0000},
	journal = {Journal of Symbolic Computation},
	keywords = {Logic, Symbolic computation},
	number = {5},
	pages = {523-538},
	title = {The meaning of infinity in calculus and computer algebra systems},
	url_pdf = {LimitTheory.pdf},
	volume = {39},
	year = {2005}} 
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