APO 发表于 2025-3-23 10:57:31

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无辜 发表于 2025-3-23 15:43:35

Graphs with regular neighbourhoods,there are only two vertex degrees, and the vertices of each degree induce a regular subgraph of G. The eigenvalues of each of these subgraphs determine the eigenvalues of the other. We are able to construct non-trivial NR-regular graphs with 4, 8, 28 and 32 vertices, and conjecture that there are infinitely many more.

Cumulus 发表于 2025-3-23 20:33:41

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Sciatica 发表于 2025-3-24 00:23:17

Doubly and orthogonally resolvable quadruple systems,∩ γ′.|⩽1 for all i and j. This paper contains constructions of (2,3)(1,1)-doubly resolvable quadruple systems of orders v = 20,32,44, 68,80 and 104; a(2,3)-resolvable quadruple system of order 128; and some sets of mutually orthogonal resolutions of quadruple systems of all the above orders.

步履蹒跚 发表于 2025-3-24 03:04:00

Degree sequences uniquely realisable by hypergraphs,ices. Let F(s) be the set of all finite sequences of non-negative integers which have a unique realisation in the set of all s-uniform hypergraphs, and let F(s.) be the corresponding set for s.-hypergraphs. Hakimi determined F(2), and F(s) can be derived from a result of Koren. Here we determine F(2

curriculum 发表于 2025-3-24 10:33:57

On generating spatial configurations with identical interpoint distance distributions,yet have identical interpoint distance distributions. In this paper we demonstrate a method for doing this with any set of points or figures and demonstrate the application of the finding to image processing studies.

和音 发表于 2025-3-24 11:08:05

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extrovert 发表于 2025-3-24 17:25:47

Determining the asymptotic number of phylogenetic trees,points have been labelled with disjoint subsets of the labelling set. Every point of degree less than three must have a nonempty label. Formulas are found for the exact numbers of phylogenetic trees with n labels, and numerical results are presented for selected n⩽40. The asymptotic behaviour of the

废墟 发表于 2025-3-24 20:16:34

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碳水化合物 发表于 2025-3-25 00:09:39

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查看完整版本: Titlebook: Combinatorial Mathematics VII; Proceedings of the S Robert W. Robinson,George W. Southern,Walter D. Wa Conference proceedings 1980 Springer