Density near zero
نویسندگان
چکیده مقاله:
Let $S$ be a dense subsemigroup of $(0,+infty)$. In this paper, we state definition of thick near zero, and also we will introduce a definition that is equivalent to the definition of piecewise syndetic near zero which presented by Hindman and Leader in [6]. We define density near zero for subsets of $S$ by a collection of nonempty finite subsets of $S$ and we investigate the conditions under these concepts.
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عنوان ژورنال
دوره 09 شماره 1
صفحات 33- 43
تاریخ انتشار 2018-01-01
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