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- W2002594953 abstract "The contact graph of an arbitrary finite packing of unit balls in Euclidean 3-space is the (simple) graph whose vertices correspond to the packing elements and whose two vertices are connected by an edge if the corresponding two packing elements touch each other. One of the most basic questions on contact graphs is to find the maximum number of edges that a contact graph of a packing of n unit balls can have. In this paper, improving earlier estimates, we prove that the number of touching pairs in an arbitrary packing of n unit balls in $${mathbb{E}^{3}}$$ is always less than $${6n - 0.926n^{frac{2}{3}}}$$ . Moreover, as a natural extension of the above problem, we propose to study the maximum number of touching triplets (resp., quadruples) in an arbitrary packing of n unit balls in Euclidean 3-space. In particular, we prove that the number of touching triplets (resp., quadruples) in an arbitrary packing of n unit balls in $${mathbb{E}^3}$$ is at most $${frac{25}{3}n}$$ (resp., $${frac{11}{4}n}$$ )." @default.
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- W2002594953 date "2013-04-01" @default.
- W2002594953 modified "2023-10-12" @default.
- W2002594953 title "Contact graphs of unit sphere packings revisited" @default.
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- W2002594953 doi "https://doi.org/10.1007/s00022-013-0156-4" @default.
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