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Abstract
A graph G for which γR(G)=2γ(G) is the Roman graph, and if γwcR(G)=2γwc(G), then G is the weakly connected Roman graph. In this paper, we show that the decision problem of whether a bipartite graph is Roman is a co-NP-hard problem. Next, we prove similar results for weakly connected Roman graphs. We also study Roman trees improving the result of M.A. Henning’s A characterization of Roman trees, Discuss. Math. Graph Theory 22 (2002). Moreover, we give a characterization of weakly connected Roman trees.
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- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.3390/math9161846
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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Mathematics
no. 9,
ISSN: 2227-7390 - Language:
- English
- Publication year:
- 2021
- Bibliographic description:
- Raczek J., Zuazua R.: Progress on Roman and Weakly Connected Roman Graphs// Mathematics -Vol. 9,iss. 16 (2021), s.1846-
- DOI:
- Digital Object Identifier (open in new tab) 10.3390/math9161846
- Sources of funding:
-
- Drugi autor otrzymała wsparcie na koszty podróży z grantu UNAM-PAPIIT IN-117219.
- Verified by:
- Gdańsk University of Technology
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