3 citations · 4 across the 31 of their papers we have counts for
6 papers · 2 filters
The topology of finite and infinite-dimensional Stiefel manifolds and the relation to Grassmannians
Nizar El Idrissi
Stiefel manifolds arise naturally as spaces of injective operators and as total spaces of principal bundles over Grassmannians. While their finite-dimensional topology is governed…
On characterizations of a some classes of Schauder frames in Banach spaces
Rafik Karkri, Samir Kabbaj, Hamad Sidi Lafdal
In this paper, we prove the following results. There exists a Banach space without basis which has a Schauder frame. There exists an universal Banach space (resp. )…
Pairs of Woven continuous frames in Hilbert spaces
Hafida Massit, Mohamed Rossafi, Samir Kabbaj
In this present paper we introduce weaving Hilbert space frames in the continuous case, we give new approaches for manufacturing pairs of woven continuous frames and we obtain new…
--frames for Hilbert spaces and the -adjoint operator
Chaimae Mezzat, Samir Kabbaj, Abdelkarim Bourouihia
In this paper, we will generelize -frames; a new concept of frames for Hilbert spaces, by --frames. The idea is to take a sequence from a Banach space and see how it can b…
On a class of Schauder frames in Banach spaces
Samir Kabbaj, Rafik Karkri, Zoubeir Hicham
In this paper, we give a characterization and a some properties of a besselian sequences, which allows us to build some examples of a besselian Schauder frames. Also for a reflexiv…
Controlled -K-operator frame for
Hatim Labrigui, Mohamed Rossafi, Abdeslam Touri +1
Frame Theory has a great revolution for recent years. This theory has been extended from Hilbert spaces to Hilbert -modules. In this paper, we introduce the concept of Co…