## Linear Operators: Self Adjoint Operators in Hilbert Space. Spectral theory. Part II |

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Page 1092

By Lemma 5 and Corollary 4 , and the elementary fact that any compact operator

may be approximated in norm by a sequence of operators T , with

finitedimensional

T has finite ...

By Lemma 5 and Corollary 4 , and the elementary fact that any compact operator

may be approximated in norm by a sequence of operators T , with

finitedimensional

**range**, it is enough to prove the lemma in the special case thatT has finite ...

Page 1395

Then ( E ( Q ) U ) x = ( 1 - E ( { 4 } ) ( 11 – T ) ) x = ( 11 — T ) x which shows that

the

neighborhood V of 2 which is disjoint from g , and let f ( u ) = ( 2 - u ) -1 if u € V

and f ( u ) = 0 if ...

Then ( E ( Q ) U ) x = ( 1 - E ( { 4 } ) ( 11 – T ) ) x = ( 11 — T ) x which shows that

the

**range**of the projection E ( 0 ) contains the**range**of T. Choose aneighborhood V of 2 which is disjoint from g , and let f ( u ) = ( 2 - u ) -1 if u € V

and f ( u ) = 0 if ...

Page 1397

This readily yields a contradiction as follows : the assumption that 0 € 0 ( T )

implies that the

easily seen to be symmetric obtained by restricting T * to D ( T ) + N . Then the

This readily yields a contradiction as follows : the assumption that 0 € 0 ( T )

implies that the

**range**R ( T ) of T is closed . Let T , be the extension – which iseasily seen to be symmetric obtained by restricting T * to D ( T ) + N . Then the

**range**R ...### What people are saying - Write a review

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### Contents

SPECTRAL THEORY Self Adjoint Operators in Hilbert Space | 858 |

BAlgebras | 859 |

Preliminary Notions | 865 |

Copyright | |

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