科研之友
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摘要
Given a metric space (X, d) and a finite set of continuous functions f(1), f(2), ... , f(N) : X -> X, we provide a sufficient condition to find a metric delta on X, equivalent with d, and a comparison function psi such that the functions f(i) : (X, delta) are psi-contractions. If the metric space (X, d) is complete, the same condition assures the exis
- 出版日期2016
