## Linear Operators: Spectral theory |

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Page 1223

for -1 = s not Ethe the ar : Orel - are the In the theory of bounded operators , we have only to verify

for -1 = s not Ethe the ar : Orel - are the In the theory of bounded operators , we have only to verify

**symmetry**( T * 2T ) , for if T is everywhere defined and**symmetric**, then T * = T. But if T is unbounded the situation is quite ...Page 1236

A set of boundary conditions B , ( x ) = 0 , i = 1 , ... , k , is said to be

A set of boundary conditions B , ( x ) = 0 , i = 1 , ... , k , is said to be

**symmetric**if the equations B , ( x ) = B , ( y ) = 0 , i = 1 , ... , k , imply the equation { x , y ) 0 . - 26 LEMMA . Let T be an operator with finite ...Page 1272

Maximal

Maximal

**symmetric**operators . If T is a**symmetric**operator with dense domain , then it has proper**symmetric**extensions provided both of its deficiency indices are different from zero . A marimal**symmetric**operator is one which has no ...### What people are saying - Write a review

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### Contents

BAlgebras | 859 |

Commutative BAlgebras | 868 |

Commutative BAlgebras | 874 |

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57 other sections not shown

### Common terms and phrases

additive adjoint operator algebra Amer analytic assume Banach spaces basis belongs Borel boundary conditions boundary values bounded called clear closed closure coefficients compact complex Consequently constant contains continuous converges Corollary corresponding defined Definition denote dense determined domain eigenvalues element equal equation essential spectrum evident Exercise exists extension finite follows formal differential operator formula function function f given Hence Hilbert space identity independent indices inequality integral interval Lemma limit linear mapping Math matrix measure multiplicity neighborhood norm obtained partial positive preceding present problem projection proof properties prove range regular remark representation respectively restriction result satisfies seen sequence shown singular solution spectral square-integrable statement subset subspace sufficiently Suppose symmetric Theorem theory topology transform unique vanishes vector zero