Results 21 to 30 of about 1,994 (184)
A time-dependent regularization of the Redfield equation
SciPost Physics, 2023 We introduce a new regularization of the Redfield equation based on a replacement of the Kossakowski matrix with its closest positive semidefinite neighbor.
Antonio D'Abbruzzo, Vasco Cavina, Vittorio Giovannetti
doaj +1 more source
Separability for mixed states with operator Schmidt rank two [PDF]
Quantum, 2019 The operator Schmidt rank is the minimum number of terms required to express a state as a sum of elementary tensor factors. Here we provide a new proof of the fact that any bipartite mixed state with operator Schmidt rank two is separable, and can be ...
Gemma De las Cuevas +2 more
doaj +1 more source
Low rank approximation of the symmetric positive semidefinite matrix
Journal of Computational and Applied Mathematics, 2014 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Xuefeng Duan +3 more
openaire +2 more sources
Complexity of the Positive Semidefinite Matrix Completion Problem with a Rank Constraint [PDF]
, 2013 18 pages, 3 ...
M. Eisenberg-Nagy (Marianna) +2 more
openaire +4 more sources
RisksWe devise two algorithms for approximating solutions of PSDisation, a problem in actuarial science and finance, to find the nearest valid correlation matrix that is positive semidefinite (PSD).
Vali Asimit +3 more
doaj +1 more source
Positive semidefinite matrix supermartingales
Electronic Journal of ProbabilityEJP.
Wang, Hongjian, Ramdas, Aaditya
openaire +2 more sources
On the Controllability of Matrix Pairs $(A,K)$ with K Positive Semidefinite [PDF]
SIAM Journal on Algebraic Discrete Methods, 1984 A well-known result of Chen and Wimmer is: If A, H and K are \(n\times n\) matrices such that H and K are Hermitian, K is positive semidefinite and \(K=AH+HA^*\) and if (A,K) is controllable, then A has no eigenvalues on the imaginary axis and H is nonsingular.
Carlson, David +2 more
openaire +2 more sources
MathematicsThis article proposes a novel robust invariance condition for uncertain linear discrete-time systems with state and control constraints, utilizing a method of semidefinite programming duality.
Hongli Yang +3 more
doaj +1 more source
Generalized Randić Estrada Indices of Graphs
Mathematics, 2022 Let G be a simple undirected graph on n vertices. V. Nikiforov studied hybrids of AG and DG and defined the matrix AαG for every real α∈[0,1] as AαG=αDG+(1−α)AG.
Eber Lenes +3 more
doaj +1 more source
Refined Upper Solution Bound of the Continuous Coupled Algebraic Riccati Equation
Complexity, 2020 The continuous coupled algebraic Riccati equation (CCARE) has wide applications in control theory and linear systems. In this paper, by a constructed positive semidefinite matrix, matrix inequalities, and matrix eigenvalue inequalities, we propose a new ...
Li Wang
doaj +1 more source