Problems from the world surrounding perfect graphs
نویسندگان
چکیده
منابع مشابه
Perfect $2$-colorings of the Platonic graphs
In this paper, we enumerate the parameter matrices of all perfect $2$-colorings of the Platonic graphs consisting of the tetrahedral graph, the cubical graph, the octahedral graph, the dodecahedral graph, and the icosahedral graph.
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A (1 + d)-dimensional thick ”brane world” model with varying Λ-term is considered. The model is generalized to the case of a chain of Ricci-flat internal spaces when the matter source is an anisotropic perfect fluid. The ”horizontal” part of potential is obtained in the Newtonian approximation. In the multitemporal case (with a Λ-term) a set of equations for potentials is presented. [email protected]...
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Throughout, G denotes a simple graph of order n (the number of vertices) and size e (the number of edges). The eigenvalues of G are the eigenvalues λi 1 Research partially supported by an NSERC postdoctoral fellowship. 2 Research supported by the Natural Sciences and Engineering Research Council of Canada. Email addresses: [email protected] (Sebastian M. Cioabă), [email protected] (D...
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ژورنال
عنوان ژورنال: Applicationes Mathematicae
سال: 1987
ISSN: 1233-7234,1730-6280
DOI: 10.4064/am-19-3-4-413-441