On the unitary Cayley graph of a finite ring.
Akhtar, Reza, Boggess, Megan, Jackson-Henderson, Tiffany, Jiménez, Isidora, Karpman, Rachel, Kinzel, Amanda, Pritikin, Dan (2009)
The Electronic Journal of Combinatorics [electronic only]
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Akhtar, Reza, Boggess, Megan, Jackson-Henderson, Tiffany, Jiménez, Isidora, Karpman, Rachel, Kinzel, Amanda, Pritikin, Dan (2009)
The Electronic Journal of Combinatorics [electronic only]
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Extracta Mathematicae
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Novi Sad Journal of Mathematics
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If D = (V, A) is a digraph, its competition graph (with loops) CGl(D) has the vertex set V and {u, v} ⊆ V is an edge of CGl(D) if and only if there is a vertex w ∈ V such that (u, w), (v, w) ∈ A. In CGl(D), loops {v} are allowed only if v is the only predecessor of a certain vertex w ∈ V. For several products D1 ⚬ D2 of digraphs D1 and D2, we investigate the relations between the competition graphs of the factors D1, D2 and the competition graph of their product D1 ⚬ D2.
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Open Mathematics
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In an Artinian ring R every element of R can be expressed as the sum of two units if and only if R/J(R) does not contain a summand isomorphic to the field with two elements. This result is used to describe those finite rings R for which Γ(R) contains a Hamiltonian cycle where Γ(R) is the (simple) graph defined on the elements of R with an edge between vertices r and s if and only if r - s is invertible. It is also shown that for an Artinian ring R the number of connected components of...