کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5777827 | 1633059 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Topological properties of some algebraically defined subsets of βN
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موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
هندسه و توپولوژی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Let S be a discrete semigroup and let the Stone-Äech compactification βS of S have the operation extending that of S which makes βS a right topological semigroup with S contained in its topological center. We show that the closure of the set of multiplicative idempotents in βN does not meet the set of additive idempotents in βN. We also show that the following algebraically defined subsets of βN are not Borel: the set of idempotents; the smallest ideal; any semiprincipal right ideal of Nâ; the set of idempotents in any left ideal; and Nâ+Nâ. We extend these results to βS, where S is an infinite countable semigroup algebraically embeddable in a compact topological group.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Topology and its Applications - Volume 220, 1 April 2017, Pages 43-49
Journal: Topology and its Applications - Volume 220, 1 April 2017, Pages 43-49
نویسندگان
Neil Hindman, Dona Strauss,