Results 71 to 80 of about 4,765 (143)
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
Nonextreme de Branges-Rovnyak spaces as models for contractions [PDF]
, 2013 The de Branges--Rovnyak spaces are known to provide an alternate functional model for contractions on a Hilbert space, equivalent to the Sz.-Nagy--Foias model.
Mashreghi, Javad, Timotin, Dan
core
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
Schur-multiplicative maps preserving unitarily invariant norms
Linear Algebra and its Applications, 2008 Let \(\|{\cdot}\| \) be a given unitary invariant norm on rectangular \(m\)-by-\(n\) matrices, and let \(A\circ B\) be the Schur (=\,entrywise) product of matrices. The author classifies \(\|{\cdot}\| \)-isometries \(\Phi:M_{m\times n}\to M_{m\times n}\) which are Schur multiplicative, that is, which satisfy \(\| \Phi(A)\| =\| A\| \) and \(\Phi(A\circ ...
openaire +1 more source
Quantum adiabatic theorem for unbounded Hamiltonians with a cutoff and its application to superconducting circuits. [PDF]
Philos Trans A Math Phys Eng Sci, 2023 Mozgunov E, Lidar DA.
europepmc +1 more source
Several unitarily invariant norm inequalities for matrices
Annals of Functional AnalysisThis paper presents new inequalities involving unitarily invariant norms of matrices, extending classical results such as the Cauchy-Schwarz and arithmetic-geometric mean inequalities in the matrix setting. The authors build upon and generalize recent work by \textit{K. M. R. Audenaert} [Oper. Matrices 9, No.
Yang, Junjian, Ma, Shengyan
openaire +2 more sources
Matrix semigroups determined by unitarily invariant norms
Linear Algebra and its Applications, 1974 AbstractThe purpose of this paper is to study the structure of the matrix semigroups defined by unitarily invariant norms and, equivalently, those defined by arbitrary ellipsoidal norms. Among other things it is found that when an element of such a semigroup has a semi-inverse, the semi-inverse is unique, and, in the case of unitarily invariant norms ...
openaire +2 more sources
Scaling Limits of Lattice Quantum Fields by Wavelets. [PDF]
Commun Math Phys, 2021 Morinelli V +3 more
europepmc +1 more source
Efficient Unitary Designs with a System-Size Independent Number of Non-Clifford Gates. [PDF]
Commun Math Phys, 2023 Haferkamp J +5 more
europepmc +1 more source
Quantifying Decoherence via Increases in Classicality. [PDF]
Entropy (Basel), 2021 Fu S, Luo S.
europepmc +1 more source