Naderi F*
In this note, we extend and improve the corresponding result of Takahashi. Explanation of DeMarr’s theorem is
further generalized for some semi groups of non-expansive self- maps on K by the following considerations which are explained in the paper. The application of Zorn’s lemma and its application are explained. An application of Zorn’s lemma shows that there exists a minimal non-empty compact convex and S-invariant subset.
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