Results 91 to 100 of about 24,845 (203)
Mathematische Nachrichten, Volume 299, Issue 4, Page 704-763, April 2026.Abstract This paper is devoted to the approximation of two‐ and three‐dimensional Dirac operators HV∼δΣ$H_{\widetilde{V} \delta _\Sigma }$ with combinations of electrostatic and Lorentz scalar δ$\delta$‐shell interactions in the norm resolvent sense. Relying on results from Behrndt, Holzmann, and Stelzer‐Landauer [Math. Nachr.
Jussi Behrndt +2 more
wiley +1 more source
A Parallelized 3D Geomechanical Solver for Fluid‐Induced Fault Slip in Poroelastic Media
International Journal for Numerical and Analytical Methods in Geomechanics, Volume 50, Issue 5, Page 2570-2586, 10 April 2026.ABSTRACT We present a fully implicit formulation of coupled fluid flow and geomechanics for fluid injection/withdrawal in fractured reservoirs in the context of CO2$\textrm {CO}_2$ storage. Utilizing a Galerkin finite‐element approach, both flow and poroelasticity equations are discretized on a shared three‐dimensional mesh.
Emil Rinatovich Gallyamov +4 more
wiley +1 more source
Estimations of the low dimensional homology of Lie algebras with large abelian ideals [PDF]
, 2013 A Lie algebra $L$ of dimension $n \ge1 $ may be classified, looking for restrictions of the size on its second integral homology Lie algebra $H_2(L,\mathbb{Z})$, denoted by $M(L)$ and often called Schur multiplier of $L$.
Francesco, G. Russo, Peyman Niroomand
core
Improved resolution of D-bar images of ventilation using a Schur complement property and an anatomical atlas. [PDF]
Med Phys, 2022 Santos TBR +6 more
europepmc +1 more source
On Orthogonal Projections of Symplectic Balls
Comptes Rendus. MathématiqueWe study the orthogonal projections of symplectic balls in $\mathbb{R}^{2n}$ on complex subspaces. In particular we show that these projections are themselves symplectic balls under a certain complexity assumption.
Dias, Nuno C. +2 more
doaj +1 more source
On inertia and schur complement in optimization
Linear Algebra and its Applications, 1987 Partitioned symmetric matrices, in particular the Hessian of the Lagrangian, play a fundamental role in nonlinear optimization. For this type of matrices \textit{S.-P. Han} and \textit{O. Fujiwara} [ibid. 72, 47-58 (1985; Zbl 0582.15002)] recently presented an inertia theorem under a certain regularity assumption.
Jongen, H.Th. +3 more
openaire +2 more sources
Synchronization of General Complex Networks with Hybrid Couplings and Unknown Perturbations
Abstract and Applied Analysis, 2013 The issue of synchronization for a class of hybrid coupled complex networks with mixed delays (discrete delays and distributed delays) and unknown nonstochastic external perturbations is studied.
Xinsong Yang +3 more
doaj +1 more source
Stochastic Stability Criteria for Neutral Distributed Parameter Systems with Markovian Jump
Complexity, 2020 This paper deals with the problem of stochastic stability for a class of neutral distributed parameter systems with Markovian jump. In this model, we only need to know the absolute maximum of the state transition probability on the principal diagonal ...
Yanbo Li, Chao-Yang Chen, Chengqun Li
doaj +1 more source
The Forward Order Law for Least Squareg-Inverse of Multiple Matrix Products
Mathematics, 2019 The generalized inverse has many important applications in the aspects of the theoretic research of matrices and statistics. One of the core problems of the generalized inverse is finding the necessary and sufficient conditions of the forward order laws ...
Zhiping Xiong, Zhongshan Liu
doaj +1 more source
Some inequalities on generalized Schur complements
Linear Algebra and its Applications, 1999 Let \(A=[A_{ij}]\) denote a block matrix of order two with square diagonal blocks. The generalized Schur complement \(S_1(A)\) of \(A_{11}\) is defined by \(S_1(A)=A_{22} -A_{21}A^+_{11} A_{12}\) where \(A^+_{11}\) denotes the Moore-Penrose pseudoinverse of \(A_{11}\) so that \(S_1(A)\) is defined also for singular matrices. For a Hermitian matrix \(A\)
Wang, Bo-Ying +2 more
openaire +1 more source