let h be a separable hilbert space and let b be the set of bessel sequences in h. by using several interesting results in operator theory we study some topological properties of frames and riesz bases by constructing a banach space structure on b. the convergence of a sequence of elements in b is de_ned and we determine whether important properties of the sequence is preserved under the con...

Due to the widespread outbreak of Covid-19, many of the world's top universities have decided to hold the next semester virtually. In our country, too, the forecasts show a red situation for some areas in terms of corona prevalence. Due to the large number of students living in these areas, planning for the next semester of universities should be more focused on e-education. According to the in...