Complex Analysis 3rd Edition by Lars Ahlfors, ISBN-13: 978-0070006577

Complex Analysis 3rd Edition by Lars Ahlfors, ISBN-13: 978-0070006577

[PDF eBook eTextbook]

• Publisher: ‎ McGraw-Hill Education; 3rd edition (January 1, 1979)
• Language: ‎ English
• 336 pages
• ISBN-10: ‎ 0070006571
• ISBN-13: ‎ 978-0070006577

A standard source of information of functions of one complex variable, this text has retained its wide popularity in this field by being consistently rigorous without becoming needlessly concerned with advanced or overspecialized material. Difficult points have been clarified, the book has been reviewed for accuracy, and notations and terminology have been modernized. Chapter 2, Complex Functions, features a brief section on the change of length and area under conformal mapping, and much of Chapter 8, Global-Analytic Functions, has been rewritten in order to introduce readers to the terminology of germs and sheaves while still emphasizing that classical concepts are the backbone of the theory. Chapter 4, Complex Integration, now includes a new and simpler proof of the general form of Cauchy’s theorem. There is a short section on the Riemann zeta function, showing the use of residues in a more exciting situation than in the computation of definite integrals.

Table of Contents:

Chapter 1: Complex Numbers1 The Algebra of Complex Numbers1.1Arithmetic Operations1.2Square Roots1.3Justification1.4Conjugation, Absolute Value1.5Inequalities2 The Geometric Representation of Complex Numbers2.1Geometric Addition and Multiplication2.2The Binomial Equation2.3Analytic Geometry2.4The Spherical RepresentationChapter 2: Complex Functions1 Introduction to the Concept of Analytic Function1.1Limits and Continuity1.2Analytic Functions1.3Polynomials1.4Rational Functions2 Elementary Theory of Power Series2.1Sequences2.2Series2.3Uniform Coverages2.4Power Series2.5 Abel’s Limit Theorem3 The Exponential and Trigonometric Functions3.1 The Exponential3.2 The Trigonometric Functions3.3 The Periodicity3.4 The LogarithmChapter 3: Analytic Functions as Mappings1 Elementary Point Set Topology1.1Sets and Elements1.2Metric Spaces1.3Connectedness1.4Compactness1.5 Continuous Functions1.6 Topological Spaces2 Conformality2.1Arcs and Closed Curves2.2Analytic Functions in Regions2.3Conformal Mapping2.4Length and Area3 Linear Transformations3.1 The Linear Group3.2 The Cross Ratio3.3 Symmetry3.4 Oriented Circles3.5 Families of Circles4 Elementary Conformal Mappings4.1 The Use of Level Curves4.2 A Survey of Elementary Mappings4.3 Elementary Riemann SurfacesChapter 4: Complex Integration1 Fundamental Theorems1.1Line Integrals1.2Rectifiable Arcs1.3Line Integrals as Functions of Arcs1.4Cauchy’s Theorem for a Rectangle1.5 Cauchy’s Theorem in a Disk2 Cauchy’s Integral Formula2.1The Index of a Point with Respect to a Closed Curve2.2The Integral Formula2.3Higher Derivatives3 Local Properties of Analytical Functions3.1 Removable Singularities. Taylor’s Theorem3.2 Zeros and Poles3.3 The Local Mapping3.4 The Maximum Principle4 The General Form of Cauchy’s Theorem4.1 Chains and Cycles4.2 Simple Connectivity4.3 Homology4.4 The General Statement of Cauchy’s Theorem4.5 Proof of Cauchy’s Theorem4.6 Locally Exact Differentials4.7 Multiply Connected Regions5 The Calculus of Residues5.1 The Residue Theorem5.2 The Argument Principle5.3 Evaluation of Definite Integrals6 Harmonic Functions6.1 Definition and Basic Properties6.2 The Mean-value Property6.3 Poisson’s Formula6.4 Schwarz’s Theorem6.5 The Reflection PrincipleChapter 5: Series and Product Developments1 Power Series Expansions1.1Wierstrass’s Theorem1.2The Taylor Series1.3The Laurent Series2 Partial Fractions and Factorization2.1Partial Fractions2.2Infinite Products2.3Canonical Products2.4 The Gamma Function2.5 Stirling’s Formula3 Entire Functions3.1 Jensen’s Formula3.2 Hadamard’s Theorem4 The Riemann Zeta Function4.1 The Product Development4.2 Extension of to the Whole Plane4.3 The Functional Equation4.4 The Zeros of the Zeta Function5 Normal Families5.1 Equicontinuity5.2 Normality and Compactness5.3 Arzela’s Theorem5.4 Families of Analytic Functions5.5 The Classical DefinitionChapter 6: Conformal Mapping, Dirichlet’s Problem1 The Riemann Mapping Theorem1.1Statement and Proof1.2Boundary Behavior1.3Use of the Reflection Principle1.4 Analytic Arcs2 Conformal Mapping of Polygons2.1The Behavior at an Angle2.2The Schwarz-Christoffel Formula2.3Mapping on a Rectangle2.4 The Triangle Functions of Schwarz3 A Closer Look at Harmonic Functions3.1 Functions with Mean-value Property3.2 Harnack’s Principle4 The Dirichlet Problem4.1 Subharmonic Functions4.2 Solution of Dirichlet’s Problem5 Canonical Mappings of Multiply Connected Regions5.1 Harmonic Measures5.2 Green’s Function5.3 Parallel Slit RegionsChapter 7: Elliptic Functions1 Simply Periodic Functions1.1Representation by Exponentials1.2The Fourier Development1.3Functions of Finite Order2 Doubly Periodic Functions2.1The Period Module2.2Unimodular Transformations2.3The Canonical Basis2.4 General Properties of Elliptic Functions3 The Weierstrass Theory3.1 The Weierstrass p-function3.2 The Functions and σ(z)3.3 The Differential Equation3.4 The Modular Function λ(r)3.5 The Conformal Mapping by λ(r)Chapter 8: Global Analytic Functions1 Analytic Continuation1.1The Weierstrass Theory1.2Germs and Sheaves1.3Sections and Riemann Surfaces1.4 Analytic Continuations along Arcs1.5 Homotopic Curves1.6 The Monodromy Theorem1.7 Branch Points2 Algebraic Functions2.1The Resultant of Two Polynomials2.2Definition and Properties of Algebraic Functions2.3 Behavior at the Critical Points3 Picard’s Theorem3.1 Lacunary Values4 Linear Differential Equations4.1 Ordinary Points4.2 Regular Singular Points4.3 Solutions at Infinity4.4 The Hypergeometric Differential Equation4.5 Riemann’s Point of ViewIndex

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