Results 51 to 60 of about 1,983 (102)
Minimal hermitian matrices with fixed entries outside the diagonal [PDF]
, 2008 We survey some results concerning the problem of finding the complex hermitian matrix or matrices of least supremum norm with variable diagonal. Some qualitative general results are given and more specific descriptions are shown for the 3 x 3 case.
Andruchow, Esteban +4 more
core
Matrix methods for Pad\'e approximation: numerical calculation of poles, zeros and residues
, 2018 A representation of the Pad\'e approximation of the $Z$-transform of a signal as a resolvent of a tridiagonal matrix $J$ is given. Several formulas for the poles, zeros and residues of the Pad\'e approximation in terms of the matrix $J$ are proposed ...
Perotti, Luca, Wojtylak, Michal
core +1 more source
A stabilizing reinforcement learning approach for sampled systems with partially unknown models
International Journal of Robust and Nonlinear Control, Volume 34, Issue 18, Page 12389-12412, December 2024.Abstract Reinforcement learning is commonly associated with training of reward‐maximizing (or cost‐minimizing) agents, in other words, controllers. It can be applied in model‐free or model‐based fashion, using a priori or online collected system data to train involved parametric architectures.
Lukas Beckenbach +2 more
wiley +1 more source
Some Preconditioning Techniques for Saddle Point Problems [PDF]
, 2006 Saddle point problems arise frequently in many applications in science and engineering, including constrained optimization, mixed finite element formulations of partial differential equations, circuit analysis, and so forth.
Benzi, Michele, Wathen, A. J.
core +1 more source
The Resurgence of the Cusp Anomalous Dimension
, 2015 This work addresses the resurgent properties of the cusp anomalous dimension's strong coupling expansion, obtained from the integral Beisert-Eden-Staudacher (BES) equation.
Aniceto, Inês
core +1 more source
The sound of swearing: Are there universal patterns in profanity? [PDF]
Psychon Bull Rev, 2023 Lev-Ari S, McKay R.
europepmc +1 more source
A fast and well-conditioned spectral method for singular integral equations [PDF]
, 2016 We develop a spectral method for solving univariate singular integral equations over unions of intervals by utilizing Chebyshev and ultraspherical polynomials to reformulate the equations as almost-banded infinite-dimensional systems.
Olver, Sheehan +1 more
core +1 more source
Two-loop renormalization-group analysis of critical behavior at m-axial Lifshitz points
, 2001 We investigate the critical behavior that d-dimensional systems with short-range forces and a n-component order parameter exhibit at Lifshitz points whose wave-vector instability occurs in a m-dimensional isotropic subspace of ${\mathbb R}^d$.
Diehl, H. W., Shpot, M.
core +3 more sources
Numerical solution of large Lyapunov equations [PDF]
A few methods are proposed for solving large Lyapunov equations that arise in control problems. The common case where the right hand side is a small rank matrix is considered.
Saad, Youcef
core +1 more source
A Systematic Extended Iterative Solution for QCD
, 1995 An outline is given of an extended perturbative solution of Euclidean QCD which systematically accounts for a class of nonperturbative effects, while allowing renormalization by the perturbative counterterms.
C.-R. Ji +31 more
core +1 more source