## Linear Operators: General theory |

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Page 19

The

X , with its

such that there exists a

...

The

**metric**topology in X is the smallest topology containing the spheres . The setX , with its

**metric**topology , is called a**metric**space . If X is a topological spacesuch that there exists a

**metric**function whose topology is the same as the original...

Page 20

A sequence { an } in a

0 . If every Cauchy sequence is convergent , a

complete . The next three lemmas are immediate consequences of the definitions

.

A sequence { an } in a

**metric**space is a Cauchy sequence if limm . n olan , an ) =0 . If every Cauchy sequence is convergent , a

**metric**space is said to becomplete . The next three lemmas are immediate consequences of the definitions

.

Page 91

admits an equivalent

invariant

complete linear

normed linear ...

admits an equivalent

**metric**under which it is complete , then G admits aninvariant

**metric**and is complete under each invariant**metric**. Thus everycomplete linear

**metric**space can be metrized to be an F - space . Further , anormed linear ...

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### Contents

B Topological Preliminaries | 10 |

quences | 26 |

Algebraic Preliminaries | 34 |

Copyright | |

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Acad algebra Amer analytic applied arbitrary assumed B-space Banach Banach spaces bounded called clear closed compact complex condition contains continuous functions converges convex Corollary countably additive defined DEFINITION denote dense determined differential disjoint Doklady Akad element equation equivalent everywhere Exercise exists extension field finite follows function defined function f given Hence Hilbert space implies inequality integral interval isomorphism Lebesgue Lemma limit linear functional linear operator linear space mapping Math meaning measure space metric neighborhood norm operator positive measure problem Proc PROOF properties proved respect Russian satisfies scalar seen semi-group separable sequence set function Show shown sphere statement subset sufficient Suppose Theorem theory topological space topology transformations u-measurable uniform uniformly unique unit valued vector weak weakly compact zero