Intersections of Sets Starshaped Via Paths of Bounded Length

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Marilyn Breen
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[1] University of Oklahoma,
[2] USA,undefined
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2000 Mathematics Subject Classification: 52A30; Key words: Starshaped sets, paths of bounded length, starshaped via α-paths;
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 Let S be a nonempty closed, simply connected set in the plane. For α > 0, let ℳ denote the family of all maximal subsets of S which are starshaped via paths of length at most α. Then ⋂{M : M in ℳ} is either starshaped via α-paths or empty. The result fails without the simple connectedness condition. However, even with a simple connectedness requirement, there is no Helly theorem for intersections of sets which are starshaped via α-paths.
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页码:105 / 109
页数:4
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