## Linear Operators: Spectral theory |

### From inside the book

Results 1-3 of 82

Page 1011

Since there is a

have |T| < |T|*+e and hence |T| < |T||. Q.E.D. 3 CorollARY. If T is in HS and {rx, & e

A} is any

Since there is a

**complete**orthonormal set containing the element ro we clearlyhave |T| < |T|*+e and hence |T| < |T||. Q.E.D. 3 CorollARY. If T is in HS and {rx, & e

A} is any

**complete**orthonormal set in S), then |T|| = { X (Tr., ra)*}}. 2, 6 e A PRoof.Page 1147

CoRoLLARy: If G is a compact topological group satisfying the second axiom of

countability, and G is not a finite set, then any

G is countable. A

CoRoLLARy: If G is a compact topological group satisfying the second axiom of

countability, and G is not a finite set, then any

**complete**set of representations ofG is countable. A

**complete**set of representations of a finite group is finite.Page 1903

(See B-space)

partially ordered space, definition, I.3.9 (8) Completely regular space,

compactification of, IV.6.22 (276), IX.2.16 (872) definition, IV.6.21 (276), IX.2.15 (

872) ...

(See B-space)

**Complete**orthonormal set, in Hilbert space, IV.4.8 (250)**Complete**partially ordered space, definition, I.3.9 (8) Completely regular space,

compactification of, IV.6.22 (276), IX.2.16 (872) definition, IV.6.21 (276), IX.2.15 (

872) ...

### What people are saying - Write a review

We haven't found any reviews in the usual places.

### Contents

BAlgebras | 859 |

Bounded Normal Operators in Hilbert Space | 887 |

Spectral Representation | 909 |

Copyright | |

17 other sections not shown

### Other editions - View all

### Common terms and phrases

adjoint extension adjoint operator algebra Amer analytic B-algebra Banach Borel set boundary conditions boundary values bounded operator closed closure Cº(I coefficients complete complex numbers continuous function converges Corollary deficiency indices Definition denote dense differential equations Doklady Akad domain eigenfunctions eigenvalues element essential spectrum exists finite dimensional follows from Lemma follows from Theorem follows immediately formal differential operator formally self adjoint formula Fourier function f Haar measure Hence Hilbert space Hilbert-Schmidt operator identity inequality integral interval kernel Lemma Let f linear operator linearly independent mapping Math matrix measure Nauk SSSR N.S. neighborhood norm open set operators in Hilbert orthogonal orthonormal Plancherel's theorem positive Proc PRoof prove real numbers satisfies sequence singular ſº solution spectral spectral set spectral theory square-integrable subspace Suppose theory To(r topology transform unique unitary vanishes vector zero