记忆法
发表于 2025-3-28 16:26:24
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一美元
发表于 2025-3-28 21:25:03
https://doi.org/10.1007/978-3-663-10855-9crossing number are introduced and related to one another. We then deal with topological techniques in the theory of chromatic numbers, and state a very ambitious meta-conjecture which is quite useful in generating true theorems. In closing, we attempt to suggest appropriate directions for further r
strain
发表于 2025-3-29 00:04:13
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Phagocytes
发表于 2025-3-29 06:47:00
https://doi.org/10.1007/978-3-322-87301-9s, (2) we can determine the first p moments by counting closed walks and then find the spectrum from the moments, or (3) we can use certain subgraphs to determine the coefficients of the characteristic polynomial and then find its roots..In practice, however, all of these approaches may prove to be
无可非议
发表于 2025-3-29 11:04:50
https://doi.org/10.1007/978-3-663-01491-1n independent set of vertices that contains at least 1/4 of the vertices of the graph. The purpose of this paper is to give an algorithm that produces an independent set in a planar graph that contains more than 2/9 of the vertices of the graph.
自作多情
发表于 2025-3-29 15:00:00
https://doi.org/10.1007/978-3-476-03772-5induce 1-factorizations of complete graphs. It is easy to show that these 1-factorizations possess enough symmetry to insure that if {F., F.} and {F., F.} are pairs of distinct 1-factors from such a 1-factorization, then the cycle structures of F. ∪ F. and F. ∪ F. are identical. The method is applie
frugal
发表于 2025-3-29 15:53:40
https://doi.org/10.1007/978-3-663-02714-0er well-known graphical invariants is discussed, and ζ is evaluated for a variety of special classes of graphs. A simple algorithm is developed for determining ζ in the case of a tree, and it is shown that this tree algorithm can be generalized to yield ζ for any connected graph. Degree conditions a
Bone-Scan
发表于 2025-3-29 22:57:32
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少量
发表于 2025-3-30 01:24:30
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Barter
发表于 2025-3-30 05:11:46
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