Elementary Calculus: An Infinitesimal approach is a textbook by H. Jerome Keisler. The subtitle alludes to the infinitesimal numbers of the hyperreal number system of Abraham Robinson and is sometimes given as An approach using infinitesimals. The book is available freely online and is currently published by Dover.
Read more about Elementary Calculus: An Infinitesimal Approach: Textbook, Reception, Transfer Principle, See Also, References
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