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MATRIX ANALYSIS AND APPLIED LINEAR ALGEBRA
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Contents Preface. . . . . . . . . . . . . . . . . . . . . . . ix 1. Linear Equations . . . . . . . . . . . . . . 1 1.1 Introduction . . . . . . . . . . . . . . . . . . 1 1.2 Gaussian Elimination and Matrices . . . . . . . . 3 1.3 Gauss–Jordan Method . . . . . . . . . . . . . . 15 1.4 Two-Po...

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  • April 2, 2024
  • 890
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

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  • matrix analysis and applied linear algebra

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  • MATRIX ANALYSIS AND APPLIED LINEAR ALGEBRA
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, Contents

Preface . . . . . . . . . . . . . . . . . . . . . . . ix

1. Linear Equations . . . . . . . . . . . . . . 1
1.1 Introduction . . . . . . . . . . . . . . . . . . 1
1.2 Gaussian Elimination and Matrices . . . . . . . . 3
1.3 Gauss–Jordan Method . . . . . . . . . . . . . . 15
1.4 Two-Point Boundary Value Problems . . . . . . . 18
1.5 Making Gaussian Elimination Work . . . . . . . . 21
1.6 Ill-Conditioned Systems . . . . . . . . . . . . . 33

2. Rectangular Systems and Echelon Forms . . . 41
2.1 Row Echelon Form and Rank . . . . . . . . . . . 41
2.2 Reduced Row Echelon Form . . . . . . . . . . . 47
2.3 Consistency of Linear Systems . . . . . . . . . . 53
2.4 Homogeneous Systems . . . . . . . . . . . . . . 57
2.5 Nonhomogeneous Systems . . . . . . . . . . . . 64
2.6 Electrical Circuits . . . . . . . . . . . . . . . . 73

3. Matrix Algebra . . . . . . . . . . . . . . 79
3.1 From Ancient China to Arthur Cayley . . . . . . . 79
3.2 Addition and Transposition . . . . . . . . . . . 81
3.3 Linearity . . . . . . . . . . . . . . . . . . . . 89
3.4 Why Do It This Way . . . . . . . . . . . . . . 93
3.5 Matrix Multiplication . . . . . . . . . . . . . . 95
3.6 Properties of Matrix Multiplication . . . . . . . 105
3.7 Matrix Inversion . . . . . . . . . . . . . . . 115
3.8 Inverses of Sums and Sensitivity . . . . . . . . 124
3.9 Elementary Matrices and Equivalence . . . . . . 131
3.10 The LU Factorization . . . . . . . . . . . . . 141

4. Vector Spaces . . . . . . . . . . . . . . . 159
4.1 Spaces and Subspaces . . . . . . . . . . . . . 159
4.2 Four Fundamental Subspaces . . . . . . . . . . 169
4.3 Linear Independence . . . . . . . . . . . . . 181
4.4 Basis and Dimension . . . . . . . . . . . . . 194

,vi Contents

4.5 More about Rank . . . . . . . . . . . . . . . 210
4.6 Classical Least Squares . . . . . . . . . . . . 223
4.7 Linear Transformations . . . . . . . . . . . . 238
4.8 Change of Basis and Similarity . . . . . . . . . 251
4.9 Invariant Subspaces . . . . . . . . . . . . . . 259

5. Norms, Inner Products, and Orthogonality . . 269
5.1 Vector Norms . . . . . . . . . . . . . . . . 269
5.2 Matrix Norms . . . . . . . . . . . . . . . . 279
5.3 Inner-Product Spaces . . . . . . . . . . . . . 286
5.4 Orthogonal Vectors . . . . . . . . . . . . . . 294
5.5 Gram–Schmidt Procedure . . . . . . . . . . . 307
5.6 Unitary and Orthogonal Matrices . . . . . . . . 320
5.7 Orthogonal Reduction . . . . . . . . . . . . . 341
5.8 Discrete Fourier Transform . . . . . . . . . . . 356
5.9 Complementary Subspaces . . . . . . . . . . . 383
5.10 Range-Nullspace Decomposition . . . . . . . . 394
5.11 Orthogonal Decomposition . . . . . . . . . . . 403
5.12 Singular Value Decomposition . . . . . . . . . 411
5.13 Orthogonal Projection . . . . . . . . . . . . . 429
5.14 Why Least Squares? . . . . . . . . . . . . . . 446
5.15 Angles between Subspaces . . . . . . . . . . . 450

6. Determinants . . . . . . . . . . . . . . . 459
6.1 Determinants . . . . . . . . . . . . . . . . . 459
6.2 Additional Properties of Determinants . . . . . . 475

7. Eigenvalues and Eigenvectors . . . . . . . . 489
7.1 Elementary Properties of Eigensystems . . . . . 489
7.2 Diagonalization by Similarity Transformations . . 505
7.3 Functions of Diagonalizable Matrices . . . . . . 525
7.4 Systems of Differential Equations . . . . . . . . 541
7.5 Normal Matrices . . . . . . . . . . . . . . . 547
7.6 Positive Definite Matrices . . . . . . . . . . . 558
7.7 Nilpotent Matrices and Jordan Structure . . . . 574
7.8 Jordan Form . . . . . . . . . . . . . . . . . 587
7.9 Functions of Nondiagonalizable Matrices . . . . . 599

, Contents vii

7.10 Difference Equations, Limits, and Summability . . 616
7.11 Minimum Polynomials and Krylov Methods . . . 642

8. Perron–Frobenius Theory . . . . . . . . . 661
8.1 Introduction . . . . . . . . . . . . . . . . . 661
8.2 Positive Matrices . . . . . . . . . . . . . . . 663
8.3 Nonnegative Matrices . . . . . . . . . . . . . 670
8.4 Stochastic Matrices and Markov Chains . . . . . 687

Index . . . . . . . . . . . . . . . . . . . . . . 705

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