## Linear Functional AnalysisThis introduction to the ideas and methods of linear functional analysis shows how familiar and useful concepts from finite-dimensional linear algebra can be extended or generalized to infinite-dimensional spaces. Aimed at advanced undergraduates in mathematics and physics, the book assumes a standard background of linear algebra, real analysis (including the theory of metric spaces), and Lebesgue integration, although an introductory chapter summarizes the requisite material. The initial chapters develop the theory of infinite-dimensional normed spaces, in particular Hilbert spaces, after which the emphasis shifts to studying operators between such spaces. Functional analysis has applications to a vast range of areas of mathematics; the final chapters discuss the particularly important areas of integral and differential equations. Further highlights of the second edition include: a new chapter on the Hahn???Banach theorem and its applications to the theory of duality. This chapter also introduces the basic properties of projection operators on Banach spaces, and weak convergence of sequences in Banach spaces - topics that have applications to both linear and nonlinear functional analysis; extended coverage of the uniform boundedness theorem; plenty of exercises, with solutions provided at the back of the book. |

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### Contents

Preliminaries | 1 |

11 Linear Algebra | 2 |

12 Metric Spaces | 11 |

13 Lebesgue Integration | 20 |

Normed Spaces | 31 |

22 Finitedimensional Normed Spaces | 39 |

23 Banach Spaces | 45 |

Inner Product Spaces Hilbert Spaces | 51 |

52 Normal Selfadjoint and Unitary Operators | 132 |

53 The Spectrum of an Operator | 139 |

54 Positive Operators and Projections | 148 |

Compact Operators | 161 |

62 Spectral Theory of Compact Operators | 172 |

63 Selfadjoint Compact Operators | 182 |

Integral and Differential Equations | 191 |

72 Volterra Integral Equations | 201 |

32 Orthogonality | 60 |

33 Orthogonal Complements | 65 |

34 Orthonormal Bases in Infinite Dimensions | 72 |

35 Fourier Series | 82 |

Linear Operators | 87 |

42 The Norm of a Bounded Linear Operator | 96 |

43 The Space BX Y and Dual Spaces | 104 |

44 Inverses of Operators | 111 |

Linear Operators on Hilbert Spaces | 123 |

73 Differential Equations | 203 |

74 Eigenvalue Problems and Greens Functions | 208 |

Solutions to Exercises | 221 |

Further Reading | 265 |

267 | |

269 | |

271 | |