### Real Analysis: Measure Theory Integration and Hilbert Spaces (ISE)

**by Elias M. Stein and Rami Shakarchi**

*Princeton University Press*

- Pub Date:
- 04/2005
- ISBN:
- 9780691113869
- Format:
- Hbk
*424 pages* - Price:
**AU$76.00***NZ$80.00*

**Product Status:**

*Not Our Publication - we no longer distribute***Instructors**

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After setting forth the basic facts of measure theory, Lebesgue integration, and differentiation on Euclidian spaces, the authors move to the elements of Hilbert space, via the L2 theory. They next present basic illustrations of these concepts from Fourier analysis, partial differential equations, and complex analysis. The final part of the book introduces the reader to the fascinating subject of fractional-dimensional sets, including Hausdorff measure, self-replicating sets, space-filling curves, and Besicovitch sets. Each chapter has a series of exercises, from the relatively easy to the more complex, that are tied directly to the text. A substantial number of hints encourage the reader to take on even the more challenging exercises.

As with the other volumes in the series, Real Analysis is accessible to students interested in such diverse disciplines as mathematics, physics, engineering, and finance, at both the undergraduate and graduate levels.

Also available, the first two volumes in the Princeton Lectures in Analysis:

Other Princeton books by Elias M. Stein: * Beijing Lectures in Harmonic Analysis. (AM-112). * Complex Analysis. * Fourier Analysis: An Introduction. * Hardy Spaces on Homogeneous Groups. (MN-28). * Harmonic Analysis: Real-Variable Methods, Orthogonality, and Oscillatory Integrals. (PMS-43). * Introduction to Fourier Analysis on Euclidean Spaces (PMS-32). * Singular Integrals and Differentiability Properties of Functions (PMS-30). * Topics in Harmonic Analysis Related to the Littlewood-Paley Theory. (AM-63).

Foreword vii

Introduction xv

1Fourier series: completion xvi

Limits of continuous functions xvi

3Length of curves xvii

4Differentiation and integration xviii

5The problem of measure xviii

Chapter 1. Measure Theory 1

1Preliminaries 1

The exterior measure 10

3Measurable sets and the Lebesgue measure 16

4Measurable functions 7

4.1 Definition and basic properties 27

4.Approximation by simple functions or step functions 30

4.3 Littlewood's three principles 33

5* The Brunn-Minkowski inequality 34

6Exercises 37

7Problems 46

Chapter 2: Integration Theory 49

1The Lebesgue integral: basic properties and convergence

theorems 49

2Thespace L 1 of integrable functions 68

3Fubini's theorem 75

3.1 Statement and proof of the theorem 75

3.Applications of Fubini's theorem 80

4* A Fourier inversion formula 86

5Exercises 89

6Problems 95

Chapter 3: Differentiation and Integration 98

1Differentiation of the integral 99

1.1 The Hardy-Littlewood maximal function 100

1.The Lebesgue differentiation theorem 104

Good kernels and approximations to the identity 108

3Differentiability of functions 114

3.1 Functions of bounded variation 115

3.Absolutely continuous functions 127

3.3 Differentiability of jump functions 131

4Rectifiable curves and the isoperimetric inequality 134

4.1* Minkowski content of a curve 136

4.2* Isoperimetric inequality 143

5Exercises 145

6Problems 152

Chapter 4: Hilbert Spaces: An Introduction 156

1The Hilbert space L 2 156

Hilbert spaces 161

2.1 Orthogonality 164

2.2 Unitary mappings 168

2.3 Pre-Hilbert spaces 169

3Fourier series and Fatou's theorem 170

3.1 Fatou's theorem 173

4Closed subspaces and orthogonal projections 174

5Linear transformations 180

5.1 Linear functionals and the Riesz representation theorem 181

5.Adjoints 183

5.3 Examples 185

6Compact operators 188

7Exercises 193

8Problems 202

Chapter 5: Hilbert Spaces: Several Examples 207

1The Fourier transform on L 2 207

The Hardy space of the upper half-plane 13

3Constant coefficient partial differential equations 221

3.1 Weaksolutions 222

3.The main theorem and key estimate 224

4* The Dirichlet principle 9

4.1 Harmonic functions 234

4.The boundary value problem and Dirichlet's principle 43

5Exercises 253

6Problems 259

Chapter 6: Abstract Measure and Integration Theory 262

1Abstract measure spaces 263

1.1 Exterior measures and Carathèodory's theorem 264

1.Metric exterior measures 266

1.3 The extension theorem 270

Integration on a measure space 273

3Examples 276

3.1 Product measures and a general Fubini theorem 76

3.Integration formula for polar coordinates 279

3.3 Borel measures on R and the Lebesgue-Stieltjes integral 281

4Absolute continuity of measures 285

4.1 Signed measures 285

4.Absolute continuity 288

5* Ergodic theorems 292

5.1 Mean ergodic theorem 294

5.Maximal ergodic theorem 296

5.3 Pointwise ergodic theorem 300

5.4 Ergodic measure-preserving transformations 302

6* Appendix: the spectral theorem 306

6.1 Statement of the theorem 306

6.Positive operators 307

6.3 Proof of the theorem 309

6.4 Spectrum 311

7Exercises 312

8Problems 319

Chapter 7: Hausdorff Measure and Fractals 323

1Hausdorff measure 324

Hausdorff dimension 329

2.1 Examples 330

2.Self-similarity 341

3Space-filling curves 349

3.1 Quartic intervals and dyadic squares 351

3.Dyadic correspondence 353

3.3 Construction of the Peano mapping 355

4* Besicovitch sets and regularity 360

4.1 The Radon transform 363

4.Regularity of sets when *d* 3 370

4.3 Besicovitch sets have dimension 371

4.4 Construction of a Besicovitch set 374

5Exercises 380

6Problems 385

Notes and References 389

Bibliography 391

Symbol Glossary 395

Index 397

"As one would expect from these authors, the exposition is, in general, excellent. The explanations are clear and concise with many well-focused examples as well as an abundance of exercises, covering the full range of difficulty. . . . [I]t certainly must be on the instructor's bookshelf as a first-rate reference book."

**---William P. Ziemer,**

*SIAM Review*