Results 101 to 110 of about 27,144 (290)

Minimum rank and maximum eigenvalue multiplicity of symmetric tree sign patterns [PDF]

, 2006
The set of real matrices described by a sign pattern (a matrix whose entries are elements of {+,−,0}) has been studied extensively but only loose bounds were available for the minimum rank of a tree sign pattern.
Hardy, Timothy L., Hogben, Leslie, Hentzel, Irvin Roy, DeAlba, Luz Maria, Wangsness, Amy, DeAlba, Luz, Hentzel, Irvin, Hardy, Timothy   +7 more
core   +2 more sources

Experience‐Dependent Reorganization of Hippocampal CA3 Neuronal Ensembles Associates With Memory Generalization

Advanced Science, EarlyView.
Mice can transfer the learned rule of spatial working memory to guide similar but novel tasks. Hippocampal CA3 populational activity dynamically reorganize during memory generalization, shifting from task‐specific to generalized coding over testing days. Sparse yet redundant neural representations of CA3 enable rule transfer and cognitive map formation,
Da Song, Zilu Zhu, Yujun Deng, Yujie Song, Hui Li, Junjun Ni, Zhenzhen Quan, Yan Yan, Hong Qing   +8 more
wiley   +1 more source

Inverse eigenvalue problems for composite banded tridiagonal matrices: symmetric and nonsymmetric cases [PDF]

Iranian Journal of Numerical Analysis and Optimization
We study an inverse eigenvalue problem associated with a special class of structured matrices in both symmetric and nonsymmetric forms. In the symmetric case, the problem involves two sets of eigenpairs corresponding to the original matrix and its ...
Maryam Babaei Zarch
doaj   +1 more source

The least eigenvalue of the complements of graphs with given connectivity [PDF]

, 2023
The least eigenvalue of a graph $G$ is the least eigenvalue of adjacency matrix of $G$. In this paper we determine the graphs which attain the minimum least eigenvalue among all complements of connected simple graphs with given connectivity.Comment: 10 ...
Li, Keng, Qiu, Huan, Wang, Guoping
core   +1 more source

Data‐Driven Discovery of Unconventional Antiferromagnets

Advanced Science, EarlyView.
A high‐throughput workflow that combines the physics‐informed pre‐screening, high‐throughput exchange calculations, Luttinger‐Tisza analysis and symmetry classification is established for accurate identification of unconventional antiferromagnets from the broad structural database.
Qirui Cui, Chenxu Liu, Anna Delin, Kaiyou Wang   +3 more
wiley   +1 more source

Performance of Cooperative Eigenvalue Spectrum Sensing with a Realistic Receiver Model under Impulsive Noise

Journal of Sensor and Actuator Networks, 2013
In this paper we present a unified comparison of the performance of four detection techniques for centralized data-fusion cooperative spectrum sensing in cognitive radio networks under impulsive noise, namely, the eigenvalue-based generalized likelihood ...
Dayan A. Guimarães, André N. Barreto, Rausley A. A. de Souza   +2 more
doaj   +1 more source

Bounds for the minimum degree eigenvalues of graphs

Boletim da Sociedade Paranaense de Matemática
In this paper we obtain several upper bounds for the minimum degree eigenvalues of Graph G.
openaire   +1 more source

Minimum vertex covers and the spectrum of the normalized Laplacian on trees [PDF]

, 2012
We show that, in the graph spectrum of the normalized graph Laplacian on trees, the eigenvalue 1 and eigenvalues near 1 are strongly related to minimum vertex covers.In particular, for the eigenvalue 1, its multiplicity is related to the size of a ...
Jost, Jürgen, Hao Chen, Jürgen Jost, Chen, Hao   +3 more
core   +1 more source

Fundamental Challenges, Physical Implementations, and Integration Strategies for Ising Machines in Large‐Scale Optimization Tasks

Advanced Electronic Materials, EarlyView.
Ising machines are emerging as specialized hardware solvers for computationally hard optimization problems. This review examines five major platforms—digital CMOS, analog CMOS, emerging devices, coherent optics, and quantum systems—highlighting physics‐rooted advantages and shared bottlenecks in scalability and connectivity.
Hyunjun Lee, Joon Pyo Kim, Sanghyeon Kim
wiley   +1 more source

Some inequalities for the Fan product of M-tensors

Journal of Inequalities and Applications, 2018
In this paper, we investigate some inequalities for the Fan product of M-tensors. We propose exact characterizations of M-tensors and establish some inequalities on the minimum eigenvalue for the Fan product of two M-tensors.
Gang Wang, Yanan Wang, Yuan Zhang
doaj   +1 more source