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*[[non-standard calculus]]
==References==
*H. Jerome Keisler: Elementary Calculus: An Approach Using Infinitesimals. First edition 1976; 2nd edition 1986. (This book is now out of print. The publisher has reverted the copyright to the author, who has made available the 2nd edition in .pdf format available for downloading at http://www.math.wisc.edu/~keisler/calc.html.)
[[Category:Calculus]]
[[Category:Model theory]]
[[Category:Real closed field]]
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