Results 51 to 60 of about 837,200 (246)
Characterization of Line-Consistent Signed Graphs
Discussiones Mathematicae Graph Theory, 2015 The line graph of a graph with signed edges carries vertex signs. A vertex-signed graph is consistent if every circle (cycle, circuit) has positive vertex-sign product. Acharya, Acharya, and Sinha recently characterized line-consistent signed graphs, i.e.
Slilaty Daniel C., Zaslavsky Thomas
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On balanced cycle domination of graphs
AKCE International Journal of Graphs and Combinatorics, 2023 Let [Formula: see text] be a graph. A function [Formula: see text] is said to be a balanced cycle dominating function (BCDF) of [Formula: see text] if [Formula: see text] holds for any induced cycle [Formula: see text] of [Formula: see text] The balanced
Baogen Xu +3 more
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Discrete Applied MathematicsLet $G$ be a graph and $A$ be its adjacency matrix. A graph $G$ is invertible if its adjacency matrix $A$ is invertible and the inverse of $G$ is a weighted graph with adjacency matrix $A^{-1}$. A signed graph $(G,σ)$ is a weighted graph with a special weight function $σ: E(G)\to \{-1,1\}$. A graph is sign-invertible (or sign-invertible) if its inverse
Isaiah Osborne, Dong Ye 0002
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Signed degree sequences of signed graphs [PDF]
Journal of Graph Theory, 1997 \textit{G. Chartrand}, \textit{H. Gavlas}, \textit{F. Harary} and \textit{M. Schultz} [Czech. Math. J. 44, No. 4, 677-690 (1994; Zbl 0837.05110)] asked whether \textit{S. L. Hakimi's} procedure [SIAM J. Appl. Math. 10, 496-506 (1962; Zbl 0109.16501)] for degree sequences in graphs also works for signed degree sequences.
Jing-Ho Yan +3 more
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From mice to humans—divergent strategies for intestinal homeostasis and regeneration
FEBS Letters, EarlyView.Recent advances such as organoid genome editing, xenotransplantation, imaging, and whole‐genome sequencing have enabled direct studies of human intestinal stem cells (ISCs). These studies reveal species‐specific features, including slower ISC proliferation, distinct injury responses, slower somatic mutation accumulation in humans, and an inverse ...
Keiko Ishikawa +2 more
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On composition of signed graphs
Discussiones Mathematicae Graph Theory, 2012 A graph whose edges are labeled either as positive or negative is called a signed graph. In this article, we extend the notion of composition of (unsigned) graphs (also called lexicographic product) to signed graphs. We employ Kronecker product of matrices to express the adjacency matrix of this product of two signed graphs and hence find its ...
K. Augustine Germina +1 more
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Design and analysis strategies for robust microbiome ageing research
FEBS Letters, EarlyView.The gut microbiome changes with age and associates with age‐related morbidity and mortality, establishing it as a potential biomarker and intervention target for ageing. Realising this potential requires methodological rigour, yet distinguishing biological signals from methodological artefacts remains challenging across cohorts. This review provides an
Mark Olenik +5 more
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European Journal of Combinatorics, 1991 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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A Graph Convolution for Signed Directed Graphs
CoRR, 2022 Preprint ...
Ko, Taewook, Kim, Chong-Kwon
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Microbiome‐blood–brain barrier interactions in aging — mechanisms and therapeutic potential
FEBS Letters, EarlyView.Aging reshapes the gut microbiome (↓SCFA‐producing commensals; ↑pro‐inflammatory outputs), shifting circulating metabolites (↓SCFAs; ↑LPS, ↑TMAO, ↑PAA) that act at the BBB to increase nonspecific transcytosis, alter transport, and promote astrocyte reactivity, heightening brain vulnerability.
Daniel Cuervo‐Zanatta +3 more
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