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  • 标题:Some fixed point theorems for set valued directional contraction mappings
  • 本地全文:下载
  • 作者:V. M. Sehgal
  • 期刊名称:International Journal of Mathematics and Mathematical Sciences
  • 印刷版ISSN:0161-1712
  • 电子版ISSN:1687-0425
  • 出版年度:1980
  • 卷号:3
  • 期号:3
  • 页码:455-460
  • DOI:10.1155/S0161171280000336
  • 出版社:Hindawi Publishing Corporation
  • 摘要:

    Let S be a subset of a metric space X and let B ( X ) be the class of all nonempty bounded subsets of X with the Hausdorff pseudometric H . A mapping F : S → B ( X ) is a directional contraction iff there exists a real α ∈ [ 0 , 1 ) such that for each x ∈ S and y ∈ F ( x ) , H ( F ( x ) , F ( z ) ) ≤ α d ( x , z ) for each z ∈ [ x , y ] ∩ S , where [ x , y ] = { z ∈ X : d ( x , z ) + d ( z , y ) = d ( x , y ) } . In this paper, sufficient conditions are given under which such mappings have a fixed point.

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