On Uncountable Frames and Riesz Bases in Nonseparable Banach Spaces

سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 98

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شناسه ملی سند علمی:

JR_SCMA-19-2_010

تاریخ نمایه سازی: 28 آبان 1401

چکیده مقاله:

Some generalizations of Besselian, Hilbertian systems and frames in nonseparable Banach spaces with respect to some nonseparable Banach space K of systems of scalars are considered in this work. The concepts of  uncountable K-Bessel, K-Hilbert systems, K-frames and  K^{*} -Riesz bases in nonseparable Banach spaces are introduced. Criteria of uncountable K-Besselianness, K-Hilbertianness for systems, K-frames and unconditional K^{*} -Riesz basicity are found, and the relationship between them is studied. Unlike before, these new facts about Besselian and Hilbertian systems in Hilbert and Banach spaces are proved without using a conjugate system and, in some cases, a completeness of a system. Examples of K-Besselian systems which are not minimal are given. It is proved that every K-Hilbertian systems is minimal. The case where K is an space of systems of coefficients of uncountable unconditional basis of some space is also considered.

کلیدواژه ها:

Nonseparable Banach space ، Uncountable unconditional basis ، K-Bessel and K-Hilbert systems ، K-frames ، uncountable unconditional K-Riesz bases

نویسندگان

Migdad Ismailov

Baku State University, Institute of Mathematics and Mechanics of the NAS of Azerbaijan.

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