Results 41 to 50 of about 1,177,096 (136)
International Journal of Robust and Nonlinear Control, Volume 36, Issue 15, Page 7088-7101, October 2026.ABSTRACT This paper presents novel results regarding the input–output finite‐time stability (IO‐FTS) of nonlinear quadratic systems (NLQSs), a class of dynamical models particularly useful for the study of robotic systems, biochemical reaction networks, and other processes of interest to the applied sciences.
Alessio Merola +5 more
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Computation of Business-Cycle Models with the Generalized Schur Method [PDF]
, 2018 Computation of business‐cycle models with the Generalized Schur ...
Heer, Burkhard, Maußner, Alfred
core +1 more source
Large Covariance Matrix Estimation by Penalized Log‐Det Heuristics
Statistical Analysis and Data Mining: An ASA Data Science Journal, Volume 19, Issue 5, October 2026.ABSTRACT We study covariance estimation in high‐dimensional approximate factor models with a sparse residual covariance. The estimator combines a log‐det loss with nuclear‐norm and off‐diagonal ℓ1$$ {\mathrm{\ell}}_1 $$ penalties on a sample‐normalized covariance scale.
Enrico Bernardi, Matteo Farnè
wiley +1 more source
, 2018 Na realnih bločnih matrikah definiramo Schurov komplement. Motivacija za definicijo izvira iz sistema linearnih enačb, ki se ga s pomočjo Schurovega komplementa lahko zreducira na reševanje manjšega sistema linearnih enačb. Na več načinov zapišemo inverz
Mihić, Željka
core
, 2011 Consider a 2×2 block complex square matrix M=[ABCD], where A and D are square matrices. Suppose that (I-AAD)B=O and C(I-AAD)=O, where AD is the Drazin inverse of A.
Xiezhang Li, Li, Xiezhang
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Schur complements and Banachiewicz-Schur forms [PDF]
, 2005 Through the matrix rank method, this paper gives necessary and sufficient conditionsfor a partitioned matrix to have generalized inverses with Banachiewicz-Schur forms. In addition, this paper investigates the idempotency of generalized Schur complements
Takane, Yoshio, Tian, Yongge
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Restricted hyperplane sections of the cross‐polytope and the simplex
Journal of the London Mathematical Society, Volume 114, Issue 4, October 2026.Abstract We give a new proof of Webb's theorem on maximal central hyperplane sections of the regular n$n$‐simplex Δn$\Delta _n$, viewed in its standard embedding in Rn+1$\mathbb {R}^{n+1}$. A similar method also yields sharp maximal estimates for noncentral sections of Δn$\Delta ^n$ whose distance d$d$ from the barycenter is small, namely d<1(n+1)(2n+1)
Silouanos Brazitikos, Christos Pandis
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Communications on Pure and Applied Mathematics, Volume 79, Issue 9, Page 2107-2157, September 2026.ABSTRACT The leading‐order asymptotic behavior of the solution of the Cauchy initial‐value problem for the Benjamin–Ono equation in L2(R)$L^2(\mathbb {R})$ is obtained explicitly for generic rational initial data u0$u_0$. An explicit asymptotic wave profile uZD(t,x;ε)$u^\mathrm{ZD}(t,x;\epsilon)$ is given, in terms of the branches of the multivalued ...
Elliot Blackstone +3 more
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GeosciencesSeismoelectric responses generated in fluid-saturated porous media contain indirect geophysical information related to subsurface interfaces, material contrasts, and electrokinetic coupling.
Peiyue Liu +5 more
doaj +1 more source
Environmetrics, Volume 37, Issue 6, September 2026.ABSTRACT In spatial regression models, unmeasured spatial variables, represented by spatial random effects, are typically not independent of observed covariates and can induce significant bias in covariate effect estimates. This fundamental problem, known as spatial confounding, has been extensively studied, but sometimes with puzzling and seemingly ...
Emiko Dupont, Isa Marques, Thomas Kneib
wiley +1 more source