منابع مشابه
More orthogonal double covers of complete graphs by Hamiltonian paths
An orthogonal double cover (ODC) of the complete graph Kn by a graph G is a collection G of n spanning subgraphs of Kn, all isomorphic toG, such that any two members ofG share exactly one edge and every edge ofKn is contained in exactly two members of G. In the 1980s Hering posed the problem to decide the existence of an ODC for the case that G is an almost-Hamiltonian cycle, i.e. a cycle of le...
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We prove that every geometrically reduced projective variety of pure dimension n over a field of positive characteristic admits a morphism to projective n-space, étale away from the hyperplane H at infinity, which maps a chosen divisor into H and some chosen smooth points not on the divisor to points not in H . This improves an earlier result of the author, which was restricted to infinite perf...
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An orthogonal cover of the complete digraph ~ K n is a collection of n spanning subgraphs ~ K n such that-every directed edge of ~ K n belongs to exactly 1 of the ~ G i 's and-for every two digraphs ~ G i and ~ G j (i 6 = j) there is a unique two-element set fa; bg of vertices such that ~ G i contains the directed edge (a; b) and ~ G j contains the directed edge (b; a). It is proven that there ...
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For an arbitrary graph G = (V,E), let X be a graphical property that can be possessed, or satisfied by the subsets of V . For example, being a clique (maximal complete subgraph), a maximal independent set, an edge, a closed neighborhood, a minimal dominating set, etc. Let CX ={A|A ⊆ V , |A| > 1, and A possesses or satisfies property X}. A set S is an X cover (or X free) if A ∩ S (or A ∩ (V − S)...
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We study the automorphic theta representation $Theta_{2n}^{(r)}$ on the $r$-fold cover of the symplectic group $Sp_{2n}$. This representation is obtained from the residues of Eisenstein series on this group. If $r$ is odd, $nle r
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ژورنال
عنوان ژورنال: American Journal of Occupational Therapy
سال: 1980
ISSN: 0272-9490
DOI: 10.5014/ajot.34.6.407c