Results 71 to 80 of about 1,194 (210)
Relativistic Lee Model and its Resolvent Analysis
, 2023 We reexamine the relativistic 2+1 dimensional Lee model in light-front coordinates on flat space and on a space-time with a spatial section given by a compact manifold in the usual canonical formalism.
Jagvaral, Yesukhei +2 more
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Resolvent analysis in unbounded flows : role of free-stream modes
, 2020 The problem of finding optimal forcing and response for unbounded base flows, exemplified by the Blasius boundary layer, is assessed by means of a locally parallel resolvent analysis.
Nogueira, P. A. S. +3 more
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Linear and nonlinear abstract differential equations of high order
Open Mathematics, 2015 The nonlocal boundary value problems for linear and nonlinear degenerate abstract differential equations of arbitrary order are studied. The equations have the variable coefficients and small parameters in principal part.
Shakhmurov Veli B.
doaj +1 more source
Topics on the spectral properties of degenerate non-self-adjoint differential operators
Journal of Inequalities and Applications, 2016 Let ( P u ) ( t ) = − d d t ( ω 2 ( t ) q ( t ) d u ( t ) d t ) $( Pu ) ( t ) =- \frac{d}{dt} ( \omega^{2} ( t ) q ( t ) \frac{du ( t )}{dt} )$ be a degenerate non-self-adjoint operator defined on the space H ℓ = L 2 ( 0 , 1 ) ℓ $H_{\ell} = L^{2} (0,1)^{\
Ali Sameripour, Yousef Yadollahi
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Commutable Matrix-Valued Functions and Operator-Valued Functions
Communications in Advanced Mathematical Sciences, 2020 A simple expression is established for an analytic commutable matrix-valued function. Then a characterization of two by two functional commutative matrices is proven.
Abdelaziz Maouche
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The spectrum of α-resolvable block designs with block size 3
Discrete Mathematics, 1991 A balanced incomplete block design \(D(v,k,\lambda)\) is called \(\alpha\)- resolvable if its blocks can be partitioned into classes such that each point of the design lies in exactly \(\alpha\) blocks of each class. Necessary conditions for such a partitioning to exist include (i) \(bk=vr\); (ii) \(\lambda (v-1)=r(k-1)\); (iii) \(k\mid \alpha v\); (iv)
Jungnickel, Dieter +2 more
openaire +1 more source
Hypergeometric expression for the resolvent of the discrete Laplacian in low dimensions
, 2020 We present an explicit formula for the resolvent of the discrete Laplacian on the square lattice, and compute its asymptotic expansions around thresholds in low dimensions.
Ito, Kenichi, Jensen, Arne; id_orcid
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Some remarks on degenerate hypoelliptic Ornstein-Uhlenbeck operators [PDF]
, 2014 We study degenerate hypoelliptic Ornstein–Uhlenbeck operators in spaces with respect to invariant measures. The purpose of this article is to show how recent results on general quadratic operators apply to the study of degenerate hypoelliptic Ornstein ...
Pavliotis, Grigorios +8 more
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Resolvent expansions of 3D magnetic Schrödinger operators and Pauli operators
, 2023 We obtain asymptotic resolvent expansions at the threshold of the essential spectrum for magnetic Schrödinger and Pauli operators in dimension three.
Jensen, Arne; id_orcid, Kovarik, Hynek
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Spectral properties of fractional differentiation operators
Electronic Journal of Differential Equations, 2018 We consider the fractional differentiation operators in a variety of senses. We show that the strong accretive property is the common property of fractional differentiation operators.
Maksim V. Kukushkin
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