Results 251 to 260 of about 2,695 (277)

Error Bounds for Approximations to Expectation Values of Unbounded Operators

Journal of Mathematical Physics, 1966
A bound for |(BΨ, Ψ) — (Bφ, φ)|, the error between the expectation value of a self-adjoint operator B on an eigenfunction Ψ of a self-adjoint Hamiltonian H and the value given by an approximating vector φ, is obtained when H is a radial Schödinger operator and B is multiplicative and unbounded.
Bazley, N. W., Fox, D. W.
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Perturbation bounds for angular sectors of spectra of unbounded operators

ANNALI DELL'UNIVERSITA' DI FERRARA, 2021
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Conformation ofLac repressor tetramer in solution, bound and unbound to operator DNA

Microscopy Research and Technique, 1997
We tested whether the Steitz et al. [(1974) Proc. Natl. Acad. Sci. U.S.A., 71:593-597] model of lactose repressor (LacR) (14 x 6.0 x 4.5 nm) represented the shape of free or operator-bound LacR in solution. The model predicts a 14 nm length for bound LacR. Direct measurement, using Pt-C shadow width standards, was 9.6 +/- 0.2 nm long.
G C, Ruben, T B, Roos
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Bounds for eigenvalues of a class of unbounded, nonsymmetric operators

Numerical Functional Analysis and Optimization, 1983
A method is presented for generating a sequence of lower and upper bounds for the eigenvalues of the problem (i) Tu-λSu = 0, where T and S belong to a class of unbounded and nonsymmetric operators in a separable Hilbert space. Sufficient conditions are derived for the convergence of the sequence of bounds to the eigenvalues of (i), and the ...
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Lower bound to the ground-state expectation value of a positive unbounded operator using related bounded operators

Journal of Mathematical Chemistry, 2012
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Marmorino, M. G., Almayouf, Abdullah, Krause, Tyler, Le, Doan   +3 more
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Approximation of unbounded operators by bounded operators and related extremal problems

Russian Mathematical Surveys, 1996
The unit sphere in \(L^p\oplus L^q\) \dots{} In this expository article, dedicated to the memory of Sergei Borisovich Stechkin, the author describes the current state of affairs with regards to the question of approximation of unbounded linear operators by bounded linear operators on a class of elements of a Banach space starting with the formulation ...
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Polynomially unbounded product of two polynomially bounded operators

Integral Equations and Operator Theory, 1997
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The Spectral Theorem for Bounded Normal Operators

2018
In this chapter we prove the spectral theorem for bounded normal operators T in \(\mathcal{B}(\mathcal{H})\).
Colombo F, Gantner J, Kimsey DP
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Approximation of generalized bounded solutions of evolution equations with unbounded operator

Nonlinear Oscillations, 2011
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A BOUND FOR SIMILARITY CONDITION NUMBERS OF UNBOUNDED OPERATORS WITH HILBERT–SCHMIDT HERMITIAN COMPONENTS

Journal of the Australian Mathematical Society, 2014
AbstractLet $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}H$ be a linear unbounded operator in a Hilbert space.
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