Results 71 to 80 of about 19,389 (202)
Sparse graph signals – uncertainty principles and recovery
GAMM-Mitteilungen, Volume 48, Issue 2, June 2025.ABSTRACT We study signals that are sparse either on the vertices of a graph or in the graph spectral domain. Recent results on the algebraic properties of random integer matrices as well as on the boundedness of eigenvectors of random matrices imply two types of support size uncertainty principles for graph signals.
Tarek Emmrich +2 more
wiley +1 more source
Singular value inequalities for generalized anticommutators
Journal of Inequalities and ApplicationsWe shown among other inequalities that if A 1 $A_{1}$ , B 1 $B_{1}$ , X 1 $X_{1}$ , and Y 1 $Y_{1}$ are n × n $n\times n$ complex matrices such that A 1 $A_{1}$ and B 1 $B_{1}$ are positive semidefinite, then s j ( Y 1 A 1 X 1 − X 1 B 1 Y 1 ) ≤ s j ( Z ⊕
Manal Al-Labadi +2 more
doaj +1 more source
On the stability of Runge–Kutta methods for arbitrarily large systems of ODEs
Communications on Pure and Applied Mathematics, Volume 78, Issue 4, Page 821-855, April 2025.Abstract We prove that Runge–Kutta (RK) methods for numerical integration of arbitrarily large systems of Ordinary Differential Equations are linearly stable. Standard stability arguments—based on spectral analysis, resolvent condition or strong stability, fail to secure the stability of RK methods for arbitrarily large systems.
Eitan Tadmor
wiley +1 more source
Preconditioning Techniques for Generalized Sylvester Matrix Equations
Numerical Linear Algebra with Applications, Volume 32, Issue 2, April 2025.ABSTRACT Sylvester matrix equations are ubiquitous in scientific computing. However, few solution techniques exist for their generalized multiterm version, as they now arise in an increasingly large number of applications. In this work, we consider algebraic parameter‐free preconditioning techniques for the iterative solution of generalized multiterm ...
Yannis Voet
wiley +1 more source
Some fractional integral inequalities involving extended Mittag-Leffler function with applications
AIMS MathematicsIntegral inequalities and the Mittag-Leffler function play a crucial role in many branches of mathematics and applications, including fractional calculus, mathematical physics, and engineering.
Sabir Hussain +4 more
doaj +1 more source
Deformations of quantum field theories on de Sitter spacetime
, 2011 Quantum field theories on de Sitter spacetime with global U(1) gauge symmetry are deformed using the joint action of the internal symmetry group and a one-parameter group of boosts.
Bieliavsky P. +7 more
core +1 more source
Locally constant fibrations and positivity of curvature
Bulletin of the London Mathematical Society, Volume 57, Issue 4, Page 1005-1025, April 2025.Abstract Up to finite étale cover, any smooth complex projective variety X$X$ with nef anti‐canonical bundle is a holomorphic fibre bundle over a smooth projective variety with trivial canonical class (K‐trivial variety for short) with locally constant transition functions. We show that this result is optimal by proving that any projective fibre bundle
Niklas Müller
wiley +1 more source
Unitarily invariant norm inequalities involving $G_1$ operators
, 2018 To appear in Commun.
openaire +3 more sources
Multireference Coupled‐Cluster Theory: The Internally Contracted Route
WIREs Computational Molecular Science, Volume 15, Issue 2, March/April 2025.Highly accurate quantum chemistry beyond the single‐reference regime remains a challenging scientific adventure. ABSTRACT Transferring the success of the coupled‐cluster expansion for single‐determinant references to multireference cases remains a challenge.
Robert G. Adam +2 more
wiley +1 more source
Interpolated inequalities for unitarily invariant norms
Linear Algebra and its Applications, 2015 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire +2 more sources