Results 21 to 30 of about 48 (48)

Evaluating balancing on social networks through the efficient solution of correlation clustering problems

EURO Journal on Computational Optimization, 2017
One challenge for social network researchers is to evaluate balance in a social network. The degree of balance in a social group can be used as a tool to study whether and how this group evolves to a possible balanced state.
Mario Levorato, Rosa Figueiredo, Yuri Frota, Lúcia Drummond   +3 more
doaj   +1 more source

Skew-signings of positive weighted digraphs

Arab Journal of Mathematical Sciences, 2018
An arc-weighted digraph is a pair (D , ω) where D is a digraph and ω is an arc-weight function that assigns to each arc u v of D a nonzero real number ω (u v) .
Kawtar Attas, Abderrahim Boussaïri, Mohamed Zaidi   +2 more
doaj   +1 more source

Kontsevich's star-product up to order 7 for affine Poisson brackets: where are the Riemann zeta values? [PDF]

Open Communications in Nonlinear Mathematical Physics
The Kontsevich star-product admits a well-defined restriction to the class of affine -- in particular, linear -- Poisson brackets; its graph expansion consists only of Kontsevich's graphs with in-degree $\leqslant 1$ for aerial vertices.
Ricardo Buring, Arthemy V. Kiselev
doaj   +1 more source

Signed graphs with strong (anti-)reciprocal eigenvalue property

Special Matrices
A (signed) graph is said to exhibit the strong reciprocal (anti-reciprocal) eigenvalue property (SR) (resp., (-SR)) if for any eigenvalue λ\lambda , it has 1λ\frac{1}{\lambda } (resp.,−1λ-\frac{1}{\lambda }) as an eigenvalue as well, with the same ...
Belardo Francesco, Huntington Callum
doaj   +1 more source

Eigenvalues of complex unit gain graphs and gain regularity

Special Matrices
A complex unit gain graph (or T{\mathbb{T}}-gain graph) Γ=(G,γ)\Gamma =\left(G,\gamma ) is a gain graph with gains in T{\mathbb{T}}, the multiplicative group of complex units.
Brunetti Maurizio
doaj   +1 more source

Computing the determinant of a signed graph

Open Mathematics
A signed graph is a simple graph in which every edge has a positive or negative sign. In this article, we employ several algebraic techniques to compute the determinant of a signed graph in terms of the spectrum of a vertex-deleted subgraph.
Alshamary Bader, Stanić Zoran
doaj   +1 more source

Sombor Index, Randic Index, and Forgotten Index of Fuzzy Coprime Graph on Dihedral Group

InPrime
This research investigates the topological indices—Sombor, Randic, and Forgotten—of the fuzzy coprime graph constructed from dihedral groups. These indices, which quantify graph structural properties, have important applications in mathematical ...
Gusti Yogananda Karang, I Gede Adhitya Wisnu Wardhana, Ni Wayan Switrayni   +2 more
doaj   +1 more source

Some bounds on the distance-sum-connectivity matrix. [PDF]

J Inequal Appl, 2018
Gök GK.
europepmc   +1 more source

Elite Bernoulli-based mutated dung beetle algorithm for global complex problems and parameter estimation of solar photovoltaic models. [PDF]

Sci Rep
Elhosseny M, Abdel-Salam M, Nayyar A, Çelik E, Mahajan S, Bacanin N, El-Hasnony IM.   +6 more
europepmc   +1 more source

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Weighted graphs with an application to returned sequence

Advanced Studies: Euro-Tbilisi Mathematical Journal, 2023
Ali Shukur
exaly