Results 41 to 50 of about 477 (64)
New bounds on the Lieb-Thirring constants
, 1999 Improved estimates on the constants $L_{\gamma,d}$, for $1 ...
Hundertmark, D., Laptev, A., Weidl, T.
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A family of anisotropic integral operators and behaviour of its maximal eigenvalue
, 2011 We study the family of compact integral operators $\mathbf K_\beta$ in $L^2(\mathbb R)$ with the kernel K_\beta(x, y) = \frac{1}{\pi}\frac{1}{1 + (x-y)^2 + \beta^2\Theta(x, y)}, depending on the parameter $\beta >0$, where $\Theta(x, y)$ is a symmetric ...
Mityagin, B. S, Sobolev, A. V.
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Variation of discrete spectra for non-selfadjoint perturbations of selfadjoint operators
, 2013 Let B=A+K where A is a bounded selfadjoint operator and K is an element of the von Neumann-Schatten ideal S_p with p>1. Let {\lambda_n} denote an enumeration of the discrete spectrum of B.
E.B. Davies +16 more
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Matrix formulation for infinite-rank operators
, 2012 Every finite-rank operator on a linear space X is the composition of an operator from X to a finite dimensional Euclidean space and of an operator from that Euclidean space to X .
B. V. Limaye
semanticscholar +1 more source
Inverse problems for Jacobi operators I: Interior mass-spring perturbations in finite systems
, 2011 We consider a linear finite spring mass system which is perturbed by modifying one mass and adding one spring. From knowledge of the natural frequencies of the original and the perturbed systems we study when masses and springs can be reconstructed. This
del Rio, Rafael, Kudryavtsev, Mikhail
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On the Gauss map of quadric surfaces
, 2019 In this paper, we study quadric surfaces in the 3-dimensional Euclidean space whose Gauss map n is of coordinate finite I-type, i.e., the position vector n satisfies the relation {\Delta}In = {\Lambda}n, where {\Delta}I is the Laplace operator with ...
Al-Zoubi, Hassan
core
Expansion of eigenvalues of the perturbed discrete bilaplacian. [PDF]
Mon Hefte Math, 2022 Kholmatov SY +2 more
europepmc +1 more source
Efficient numerical computation of the basic reproduction number for structured populations. [PDF]
J Comput Appl Math, 2021 Breda D +3 more
europepmc +1 more source
Collocation of Next-Generation Operators for Computing the Basic Reproduction Number of Structured Populations. [PDF]
J Sci Comput, 2020 Breda D +3 more
europepmc +1 more source
Spectral analysis in thin tubes with axial heterogeneities
, 2015 Rita Ferreira +2 more
semanticscholar +1 more source