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Compact packings of the plane with two sizes of discs

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arxiv math/0407145 v2 pith:H26L46YD submitted 2004-07-08 math.MG

classification math.MG
keywords packingscompactdiscsnineplanepossibletangentvalues
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We consider packings of the plane using discs of radius 1 and r. A packing is compact if every disc D is tangent to a sequence of discs D_1, D_2, ..., D_n such that D_i is tangent to D_{i+1}. We prove that there are only nine values of r with r<1 for which such packings are possible. For each of the nine values we describe the possible compact packings.

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