Results 61 to 70 of about 59,171 (165)

An S-type upper bound for the largest singular value of nonnegative rectangular tensors

Open Mathematics, 2016
An S-type upper bound for the largest singular value of a nonnegative rectangular tensor is given by breaking N = {1, 2, … n} into disjoint subsets S and its complement. It is shown that the new upper bound is smaller than that provided by Yang and Yang (
Zhao Jianxing, Sang Caili
doaj   +1 more source

On the effect of the perturbation of a nonnegative matrix on its Perron eigenvector [PDF]

, 1982
Elsner L, Johnson CR, Neumann MM. On the effect of the perturbation of a nonnegative matrix on its Perron eigenvector. Czechoslovak Mathematical Journal.
Elsner, Ludwig F., Elsner, Ludwig, Neumann, M., Johnson, Charles R., Johnson, C. R., Neumann, Michael M.   +5 more
core   +1 more source

Autoregressive Hypergraph

Journal of Time Series Analysis, EarlyView.
ABSTRACT Traditional graph representations are insufficient for modelling real‐world phenomena involving multi‐entity interactions, such as collaborative projects or protein complexes, necessitating the use of hypergraphs. While hypergraphs preserve the intrinsic nature of such complex relationships, existing models often overlook temporal evolution in
Xianghe Zhu, Qiwei Yao
wiley   +1 more source

Further Results on Cauchy Tensors and Hankel Tensors

, 2016
In this article, we present various new results on Cauchy tensors and Hankel tensors. We first introduce the concept of generalized Cauchy tensors which extends Cauchy tensors in the current lit-erature, and provide several conditions characterizing ...
Li, G ; https://orcid.org/, Liqun Qi, Qi, L, Haibin Chen, Guoyin Li, Chen, H   +5 more
core   +1 more source

Identification and Estimation of Multi‐order Tensor Factor Models

Journal of Time Series Analysis, EarlyView.
ABSTRACT We propose a novel framework in high‐dimensional factor models to simultaneously analyze multiple tensor time series, each with potentially different tensor orders and dimensionality. The connection between different tensor time series is through their global factors that are correlated with each other.
Zetai Cen
wiley   +1 more source

Measure‐valued processes for energy markets

Mathematical Finance, Volume 35, Issue 2, Page 520-566, April 2025.
Abstract We introduce a framework that allows to employ (non‐negative) measure‐valued processes for energy market modeling, in particular for electricity and gas futures. Interpreting the process' spatial structure as time to maturity, we show how the Heath–Jarrow–Morton approach can be translated to this framework, thus guaranteeing arbitrage free ...
Christa Cuchiero, Luca Di Persio, Francesco Guida, Sara Svaluto‐Ferro   +3 more
wiley   +1 more source

Is the World Getting Smaller? Network‐Driven Heterogeneity in Gravity‐Model Elasticities

The World Economy, EarlyView.
ABSTRACT Gravity models constitute the workhorse of empirical international trade research, yet the temporal stability of their core parameters—distance and GDP elasticities—remains underexplored, particularly in relation to the evolving structure of trade networks.
Zsolt T. Kosztyán, Rita Mátrai, Dénes Kiss   +2 more
wiley   +1 more source

Existence of the solutions of an interval tensor complementarity problem [PDF]

ریاضی و جامعه
In this paper, we consider a general tensor complementarity problem with interval parameters, and study the conditions under which, the existence and uniqueness of the solution of the problem are guaranteed.
Rozita Beheshti, Javad Fathi, Mostafa Zangiabadi   +2 more
doaj   +1 more source

Surrogate Computational Homogenization Enhanced by Partition‐of‐Unity RBF Interpolation With Decision Trees

International Journal for Numerical Methods in Engineering, Volume 127, Issue 20, 30 October 2026.
ABSTRACT This study enhances a framework of surrogate computational homogenization (SCH) using decision tree‐based partition‐of‐unity radial basis function (PU‐RBF) interpolation for three‐dimensional finite‐deformation two‐scale analysis. The method addresses the scalability limitation of global RBF interpolation for large numerical material test (NMT)
Yosuke Yamanaka, Norio Hirayama, Kenjiro Terada   +2 more
wiley   +1 more source

Polytopes of Stochastic Tensors

, 2016
Considering n × n × n stochastic tensors (aijk)(i.e., nonnegative hypermatrices in which every sum over one index i, j, or k, is 1), we study the polytope (Ωn) of all these tensors, the convex set (Ln) of all tensors in Ωn with some positive diagonals ...
Zhang, Fuzhen, Paksoy, Vehbi Emrah, Chang, Haixia   +2 more
core   +1 more source