کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5774654 | 1413564 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Efimov spaces and the separable quotient problem for spaces Cp(K)
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موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
آنالیز ریاضی
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چکیده انگلیسی
The classic Rosenthal-Lacey theorem asserts that the Banach space C(K) of continuous real-valued maps on an infinite compact space K has a quotient isomorphic to c or â2. More recently, Ka̧kol and Saxon [20] proved that the space Cp(K) endowed with the pointwise topology has an infinite-dimensional separable quotient algebra iff K has an infinite countable closed subset. Hence Cp(βN) lacks infinite-dimensional separable quotient algebras. This motivates the following question: (â) Does Cp(K) admit an infinite-dimensional separable quotient (shortly SQ) for any infinite compact space K? Particularly, does Cp(βN) admit SQ? Our main theorem implies that Cp(K) has SQ for any compact space K containing a copy of βN. Consequently, this result reduces problem (â) to the case when K is an Efimov space (i.e. K is an infinite compact space that contains neither a non-trivial convergent sequence nor a copy of βN). Although, it is unknown if Efimov spaces exist in ZFC, we show, making use of some result of R. de la Vega (2008) (under â), that for some Efimov space K the space Cp(K) has SQ. Some applications of the main result are provided.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Mathematical Analysis and Applications - Volume 457, Issue 1, 1 January 2018, Pages 104-113
Journal: Journal of Mathematical Analysis and Applications - Volume 457, Issue 1, 1 January 2018, Pages 104-113
نویسندگان
J. Ka̧kol, W. Åliwa,