Linear Operators: Spectral operators |
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Page 2154
... dense in . By induction , it is seen that the manifold - ( T − \ I ) n + kX + { x | ( T − λI ) n + kx = 0 } is dense in X for all k≥0 . This fact will be stated in the following lemma for future reference . 6 LEMMA . A complex number ...
... dense in . By induction , it is seen that the manifold - ( T − \ I ) n + kX + { x | ( T − λI ) n + kx = 0 } is dense in X for all k≥0 . This fact will be stated in the following lemma for future reference . 6 LEMMA . A complex number ...
Page 2156
... dense in X , so that ≤ + { x | ( ^ 21 - T ) x = 0 } - - - is also dense in X. By Lemma 7 , σ ( x ) − y if ( λ , I − T ) x = 0 for i = 1 or - i = 2 , so that to prove the present lemma it will be sufficient to show that every element ...
... dense in X , so that ≤ + { x | ( ^ 21 - T ) x = 0 } - - - is also dense in X. By Lemma 7 , σ ( x ) − y if ( λ , I − T ) x = 0 for i = 1 or - i = 2 , so that to prove the present lemma it will be sufficient to show that every element ...
Page 2159
... dense on г 。. Some results in this direction will be found in the next four lemmas . 0 11 LEMMA ( G ) . The union of all intervals of constancy relative to T is an open set dense in T 。. PROOF . It is clear that the union of intervals ...
... dense on г 。. Some results in this direction will be found in the next four lemmas . 0 11 LEMMA ( G ) . The union of all intervals of constancy relative to T is an open set dense in T 。. PROOF . It is clear that the union of intervals ...
Contents
SPECTRAL OPERATORS | 1924 |
14 | 1983 |
Sufficient Conditions | 2134 |
Copyright | |
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A₁ adjoint operator algebra of projections Amer analytic arbitrary asymptotic B₁ Banach space Boolean algebra Borel set boundary conditions bounded Borel function bounded linear operator bounded operator commuting compact complete Boolean algebra complex numbers complex plane continuous functions converges Corollary countably additive Definition denote differential operator Doklady Akad domain E₁ eigenvalues elements equation exists finite number follows from Lemma follows from Theorem follows immediately formal differential operator formula function f H₁ H₂ Hence Hilbert space hypothesis identity inequality inverse L₁ Lebesgue Math multiplicity Nauk SSSR norm operators in Hilbert perturbation PROOF properties prove quasi-nilpotent resolution Russian satisfies scalar type operator scalar type spectral Section sequence shows spectral measure spectral operator spectral theory spectrum subset Suppose trace class type spectral operator unbounded uniformly bounded vector zero