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A note on orientations of mixed graphs [PDF]

open access: bronzeDiscrete Applied Mathematics, 2002
The authors study an orientation problem on mixed graphs. The goal is to obtain a directed graph satisfying a certain connectivity requirement. First the authors continue the study of the pair connectivity problem and show that it is NP-complete for mixed graphs. Then they prove several results for two pairs of nodes of mixed graphs.
Esther M. Arkin, Refael Hassin
openalex   +2 more sources

Stable mixed graphs [PDF]

open access: hybridBernoulli, 2013
Published in at http://dx.doi.org/10.3150/12-BEJ454 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
Kayvan Sadeghi
openalex   +4 more sources

Hermitian-Randić matrix and Hermitian-Randić energy of mixed graphs [PDF]

open access: yesJournal of Inequalities and Applications, 2017
Let M be a mixed graph and H ( M ) $H(M)$ be its Hermitian-adjacency matrix. If we add a Randić weight to every edge and arc in M, then we can get a new weighted Hermitian-adjacency matrix. What are the properties of this new matrix?
Yong Lu, Ligong Wang, Qiannan Zhou
doaj   +2 more sources

Total mixed domination in graphs

open access: yesAKCE International Journal of Graphs and Combinatorics, 2022
For a graph [Formula: see text] we call a subset [Formula: see text] a total mixed dominating set of G if each element of [Formula: see text] is either adjacent or incident to an element of S, and the total mixed domination number of G is the minimum ...
Adel P. Kazemi   +2 more
doaj   +3 more sources

Stochastic and mixed flower graphs [PDF]

open access: greenPhysical Review E, 2020
11 pages, 6 ...
C. Tyler Diggans   +2 more
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Bivariate Chromatic Polynomials of Mixed Graphs [PDF]

open access: yesDiscrete Mathematics & Theoretical Computer Science, 2023
The bivariate chromatic polynomial $\chi_G(x,y)$ of a graph $G = (V, E)$, introduced by Dohmen-P\"{o}nitz-Tittmann (2003), counts all $x$-colorings of $G$ such that adjacent vertices get different colors if they are $\le y$. We extend this notion to
Matthias Beck, Sampada Kolhatkar
doaj   +4 more sources

𝕮-inverse of graphs and mixed graphs

open access: yesOpen Mathematics
This article introduces a generalization of the concept of inverse graphs applicable to both graphs and mixed graphs. Given a graph GG with adjacency matrix A(G)A\left(G), the inverse graph G−1{G}^{-1} is defined such that its adjacency matrix is similar
Alomari Omar   +2 more
doaj   +2 more sources

Colored Homomorphisms of Colored Mixed Graphs

open access: bronzeJournal of Combinatorial Theory, Series B, 2000
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jaroslav Nešetřil, André Raspaud
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On spectral integral variations of mixed graphs

open access: bronzeLinear Algebra and its Applications, 2003
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Yi-Zheng Fan
openalex   +4 more sources

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