A \converse" of the Banach Contraction Mapping Theorem

نویسندگان

  • Pascal Hitzler
  • Anthony Karel Seda
چکیده

We prove a type of converse of the Banach contraction mapping theorem for metric spaces: if X is a T 1 topological space and f : X ! X is a function with unique xed point a such that f n (x) converges to a for each x 2 X , then there exists a distance function d on X such that f is a contraction on the complete ultrametric space (X; d) with contractivity factor 1 2. We explore properties of the resulting space (X; d) .

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تاریخ انتشار 2001