Uniqueness of Positive Fixed Points for Increasing Concave Functions on U?: an Elementary Result

نویسندگان

  • JOHN KENNAN
  • Rabah Amir
  • Bart Lipman
  • Peter Norman
  • Kevin Reffett
  • Larry Samuelson
چکیده

The square root function has a unique positive ¿xed point. This function has the following properties: it is strictly increasing and strictly concave, with sEf ' f, sE@ : @ for @ , and sEK K for K : . It is shown that any function from U to U satisfying these properties has a unique positive ¿xed point.

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تاریخ انتشار 2001