Abstract

In this paper, we first study the stratified structure of the derived sets and the distributional rules of the accumulation points of the f-sets. Then we give some conditions that are equivalent to (A ⌣ B)d = Ad ⌣ Bd for any A, B ϵ [0, 1]x. Finally we introduce the general f-derived operator on X and by which we characterize the general fts X.

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