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J. Cel
TIETZE-TYPE THEOREM FOR PARTIALLY CONVEX PLANAR SETSAbstract
Let S be a nonempty subset of R2 and R2 a set of directions. S is called V-convex or partially convex relative to at a point s clS if and only if there exists a neighbourhood N of s in R2 such that the intersection of any straight line parallel to a vector in with S N is connected or empty S is called -convex or partially convex relative to if and only if the intersection of any straight line parallel to a vector in with S is connected or empty. It is proved that if is open, S is connected and open or polygonally connected and closed, and -convex at every boundary point, then it is -convex. This contributes to a recent work of Rawlins, Wood, Metelskij and others. Documents annexes
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Pour citer cet article :
J. Cel. «TIETZE-TYPE THEOREM FOR PARTIALLY CONVEX PLANAR SETS». Bulletin de la Société Royale des Sciences de Liège,
Volume 69 - Année 2000
Numéro 1 : 17 - 20
http://popups.ulg.ac.be/SRSL/document.php?id=1660 Quelques mots à propos de : J. CelWarszawska 24c/20, 26-200 Końskie, Poland
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