Ultra Bessel sequences in direct sums of Hilbert spaces
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زبان مدرک
Englishچکیده
In this paper, we establish some new results in ultra Bessel sequences and ultra Bessel sequences of subspaces. Also, we investigate ultra Bessel sequences in direct sums of Hilbert spaces. Specially, we show that {( fi, gi)}∞ i=1 is a an ultra Bessel sequence for Hilbert space H ⊕ K if and only if { fi}∞ i=1 and {gi}∞ i=1 are ultra Bessel sequences for Hilbert spaces H and K, respectively.
کلید واژگان
Frame of subspacesUltra Bessel sequence
شماره نشریه
1تاریخ نشر
2015-09-011394-06-10
ناشر
Vali-e-Asr university of Rafsanjanسازمان پدید آورنده
University of Mohaghegh ArdabiliUniversity of Maragheh
شاپا
2383-19362476-3926
