Combinatorial Complexity Bounds for Arrangements of Curves And Surfaces
Combinatorial Complexity Bounds for Arrangements of Curves And Surfaces
Kenneth L Clarkson
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7 below) which indicates that we will use a forbidden A'^. J argument, that is, no two cells touch t common unit-circles (we choose t = 3). This is, however, not true in general for any t as shown in Figure 4. 3. We get around this Figure 4. 3: Cells c x and ci touch five common unit-circles. difficulty by considering a constant number of different cases and using a forbidden A'2. 3 argument for each but one case. Canham Threshold 4. 7 The maximum number of edges bounding m cells in an arrangem...ent of n unit-circles in the plane is 0(mn" 2 4- n). Proof. Let M denote the set of m cells, let N be the set of n unit-circles, and define y - ( A/l. V. A . With (c, u) € A if cell c touches unit-circle u. As mentioned above, we do a case-analysis which, in effect, considers Q as the union of a constant number of subgraphs. The cases that we distinguish are Case 1. Q\ — (AfUiV, ,4;), where {c, u) € A\ if c touches u and is enclosed by u. Case 2. Q = (A/U:V. . 4„), where (c, u. ) £ A if c touches u and is not enclosed by u.
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