کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8904191 | 1633045 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dually properties and cardinal inequalities
ترجمه فارسی عنوان
خواص دوگانه و نابرابری های اصلی
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موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
هندسه و توپولوژی
چکیده انگلیسی
In this paper, we prove that DCCC is self-dual with respect to neighborhood assignments. Some related results on dually CCC (or dually DCCC) spaces are also obtained. Moreover, we prove that the cardinality of a dually CCC space X is at most 2Ï if X satisfies one of the following conditions: (1) X has a rank 2-diagonal; (2) X is first countable and has a Gδ-diagonal; (3) X is first countable and perfect. Finally, we prove that the extent of a first countable dually CCC space is at most 2Ï.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Topology and its Applications - Volume 234, 1 February 2018, Pages 1-6
Journal: Topology and its Applications - Volume 234, 1 February 2018, Pages 1-6
نویسندگان
Wei-Feng Xuan, Yan-Kui Song,