Results 71 to 80 of about 1,034,900 (267)
Hyperbolic-parabolic singular perturbations in general regions
Le Matematiche, 1991 We consider a singular perturbations problem for the inhomogeneous damped wave equation and the inhomogeneous heat equation with moving boundary. We give rigorous and explicit estimates and show the uniform convergence.
Berardino D'Acunto
doaj
Random perturbations of singular spectra [PDF]
Proceedings of the American Mathematical Society, 1991 The singular parts of the self-adjoint operators T T and H = T + V H = T + V are mutually singular for "almost every" bounded perturbation V V .
openaire +3 more sources
Singular perturbations with boundary conditions and the Casimir effect in the half space [PDF]
, 2010 We study the self-adjoint extensions of a class of nonmaximal multiplication operators with boundary conditions. We show that these extensions correspond to singular rank 1 perturbations (in the sense of Albeverio and Kurasov [Singular Perturbations of ...
S. Albeverio +3 more
semanticscholar +1 more source
Robustness Analysis of a Class of Decentralized Control Systems [PDF]
Modeling, Identification and Control, 1986 The paper presents a method for analysing the robustness properties of a class of decentralized control systems. Perturbations both in local and in interconnection parameters are dealt with. The method is based on the use of singular values.
Ole A. Solheim
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Singular Bouncing Cosmology from Gauss-Bonnet Modified Gravity
, 2015 We study how a cosmological bounce with a Type IV singularity at the bouncing point, can be generated by a classical vacuum $F(G)$ gravity. We focus our investigation on the behavior of the vacuum $F(G)$ theory near the Type IV singular bouncing point ...
Oikonomou, V. K.
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On combined asymptotic expansions in singular perturbations
Electronic Journal of Differential Equations, 2002 A structured and synthetic presentation of Vasil'eva's combined expansions is proposed. These expansions take into account the limit layer and the slow motion of solutions of a singularly perturbed differential equation.
Eric Benoit +2 more
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Dimension of the exceptional set in the Aronszajn-Donoghue theorem for finite rank perturbations
, 2020 The classical Aronszajn-Donoghue theorem states that for a rank one perturbation of a self-adjoint operator (by a cyclic vector) the singular parts of the spectral measures of the original and perturbed operators are mutually singular.
Liaw, Constanze +2 more
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Regularization and convergence for singular perturbations [PDF]
Communications in Mathematical Physics, 1992 The authors prove a theorem in an abstract setting which is applicable to the determination of selfadjoint extensions of Schrödinger's operator when the potential is singular. Let \(A\) be a selfadjoint operator on Hilbert space \({\mathfrak h}\) and \(V\) a Hermitian operator such that for \(D\) dense in \((\text{dmn }A\cap\text{dmn }V)\), \((Vf,f ...
Neidhardt, H., Zagrebnov, V. A.
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Singular perturbations of complex polynomials
, 2013 . In this paper we describe the dynamics of singularly perturbed complex polynomials. That is, we start with a complex polynomial whose dynamics are well understood. Then we perturb this map by adding a pole, i.e., by adding in a term of the form λ/ ( z −
R. Devaney
semanticscholar +1 more source
Hybrid Normed Ideal Perturbations of n-tuples of Operators I
, 2017 In hybrid normed ideal perturbations of $n$-tuples of operators, the normed ideal is allowed to vary with the component operators. We begin extending to this setting the machinery we developed for normed ideal perturbations based on the modulus of ...
Voiculescu, Dan-Virgil
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