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Nonstandard calculus
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==Keisler's textbook== Keisler's [[Elementary Calculus: An Infinitesimal Approach]] defines continuity on page 125 in terms of infinitesimals, to the exclusion of epsilon, delta methods. The derivative is defined on page 45 using infinitesimals rather than an epsilon-delta approach. The integral is defined on page 183 in terms of infinitesimals. Epsilon, delta definitions are introduced on page 282.
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