Mathematical Background: Foundations of Innitesimal Calculus

H. Jerome. Keisler, "Mathematical Background:Foundations of Innitesimal Calculus"
Academic Press, Inc | 1997 | ISBN: 0871502151 | 214 pages | PDF | 1,3 MB

Preface to the Mathematical Background
We want you to reason with mathematics. We are not trying to get everyone to give
formalized proofs in the sense of contemporary mathematics; `proof' in this course means
`convincing argument.' We expect you to use correct reasoning and to give careful explanations.
The projects bring out these issues in the way we nd best for most students,
but the pure mathematical questions also interest some students. This book of mathematical
\background" shows how to ll in the mathematical details of the main topics from
the course. These proofs are completely rigorous in the sense of modern mathematics {
technically bulletproof. We wrote this book of foundations in part to provide a convenient
reference for a student who might like to see the \theorem - proof" approach to calculus.
We also wrote it for the interested instructor. In re-thinking the presentation of beginning
calculus, we found that a simpler basis for the theory was both possible and desirable. The
pointwise approach most books give to the theory of derivatives spoils the subject. Clear
simple arguments like the proof of the Fundamental Theorem at the start of Chapter 5 below
are not possible in that approach. The result of the pointwise approach is that instructors
feel they have to either be dishonest with students or disclaim good intuitive approximations.
This is sad because it makes a clear subject seem obscure. It is also unnecessary { by and
large, the intuitive ideas work provided your notion of derivative is strong enough. This
book shows how to bridge the gap between intuition and technical rigor...

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