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On relationship between nonconvexity of a set and nonconvexity of its e-neighbourhood
Dušan RepovšPavel V. Semenov
出版University of Ljubljana, Inst. of Mathematics, Physics and Mechanics, Department of Mathematics, 1999
URLhttp://books.google.com.hk/books?id=TG6IMgAACAAJ&hl=&source=gbs_api