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Some fixed point theorems for set valued directional contraction mappings
oleh: V. M. Sehgal
| Format: | Article |
|---|---|
| Diterbitkan: | Hindawi Limited 1980-01-01 |
Deskripsi
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))≤αd(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.