A decomposition theorem for ฯ1-convex se
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Marilyn Breen
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Article
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1982
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Elsevier Science
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English
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A set S in 1 :" is said to he X,-convex if and only if S does not contain a visually independent subset having cardinality h', . It is natural tts ask when an h',-convex set may be expressed as a countable unI.,n of convex sets. Here i! is proved that if S is a closed h',-convex set in the plane and