# Infinitesimal Calculus

Written by: Keith Duncan Stroyan (University of Iowa)

A University of Iowa professor is offering his textbook, Mathematical Background: Foundations of Infinitesimal Calculus from the university website. Keith Duncan Stroyan wrote this textbook for advanced undergraduate and beginning graduate students.

Chapter 1: Numbers
1.1 Field Axioms
1.2 Order Axioms
1.3 The Completeness Axiom
1.4 Small, Medium and Large Numbers
Chapter 2: Functional Identities
2.1 Specific Functional Identities
2.2 General Functional Identities
2.3 The Function Extension Axiom
2.5 The Motion of a Pendulum
Chapter 3: The Theory of Limits
3.1 Plain Limits
3.2 Function Limits
3.3 Computation of Limits
Chapter 4: Continuous Functions
4.1 Uniform Continuity
4.2 The Extreme Value Theorem
4.3 Bolzano’s Intermediate Value Theorem
Chapter 5: The Theory of Derivatives
5.1 The Fundamental Theorem: Part 1
5.2 Derivatives, Epsilons and Deltas
5.3 Smoothness -> Continuity of Function and Derivative
5.4 Rules -> Smoothness
5.5 The Increment and Increasing
5.6 Inverse Functions and Derivatives
Chapter 6: Pointwise Derivatives
6.1 Pointwise Limits
6.2 Pointwise Derivatives
6.3 Pointwise Derivatives Aren’t Enough for Inverses
Chapter 7: The Mean Value Theorem
7.1 The Mean Value Theorem
7.2 Darboux’s Theorem
7.3 Continuous Pointwise Derivatives are Uniform
Chapter 8: Higher Order Derivatives
8.1 Taylor’s Formula and Bending
8.2 Symmetric Differences and Taylor’s Formula
8.3 Approximation of Second Derivatives
8.4 The General Taylor Small Oh Formula
8.5 Direct Interpretation of Higher Order Derivatives
Chapter 9: Basic Theory of the Definite Integral
9.1 Existence of the Integral
9.2 You Can’t Always Integrate Discontinuous Functions
9.3 Fundamental Theorem: Part 2
9.4 Improper Integrals
Chapter 10: Derivatives of Multivariable Functions
Chapter 11: Theory of Initial Value Problems
11.1 Existence and Uniqueness of Solutions
11.2 Local Linearization of Dynamical Systems
11.3 Attraction and Repulsion
11.4 Stable Limit Cycles
Chapter 12: The Theory of Power Series
12.1 Uniformly Convergent Series
12.2 Robinson’s Sequential Lemma
12.3 Integration of Series
12.5 Calculus of Power Series
Chapter 13: The Theory of Fourier Series
13.1 Computation of Fourier Series
13.2 Convergence for Piecewise Smooth Functions
13.3 Uniform Convergence for Continuous Piecewise Smooth Functions
13.4 Integration of Fourier Series

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Infinitesimal Calculus 