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Bounding the Number of Geometric Permutations Induced byk-Transversals

โœ Scribed by Jacob E. Goodman; Richard Pollack; Rephael Wenger


Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
352 KB
Volume
75
Category
Article
ISSN
0097-3165

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โœฆ Synopsis


We prove that a suitably separated family of n compact convex sets in R d can be met by k-flat transversals in at most d&k) , or for fixed k and d, O(n k(k+1)(d&k) ) different order types. This is the first non-trivial upper bound for 12.


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Truncated Transversal Designs: A New Low
โœ Rolf S. Rees ๐Ÿ“‚ Article ๐Ÿ“… 2000 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 115 KB

A truncated transversal design TTD of type g k m 1 is a [k, k+1]-GDD of type g k m 1 in which each point on the group of size m lies only in blocks of size k+1. Thus a TTD of type g k m 1 is equivalent to a transversal design TD (k, g) having m disjoint parallel classes of blocks. We employ a new co