مشخصات پژوهش

عنوان	Ultra Bessel sequences in direct sums of Hilbert
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	Frame of subspaces, Ultra Bessel sequence,
چکیده	In this paper, we establish some new results in ultra Bessel se- quences and ultra Bessel sequences of subspaces. Also, we in- vestigate ultra Bessel sequences in direct sums of Hilbert spaces. Specially, we show that f( fi; gi)g1 i=1 is a an ultra Bessel sequence for Hilbert space H K if and only if f fig1 i=1 and fgig1 i=1 are ultra Bessel sequences for Hilbert spaces H and K; respectively.
پژوهشگران	محمدرضا عبداله پور (نفر اول)، اصغر رحیمی (نفر دوم)