RETRO BANACH FRAMES, ALMOST EXACT RETRO BANACH FRAMES IN BANACH SPACES.

In this paper, we give characterizations of retro Banach frames in Banach spaces. The notion of almost exact retro Banach frame is defined and a characterization of retro Banach frame has been given. Also results exhibiting relationship between frames, almost exact retro Banach frames and Riesz bases has been proved. Finally, we give some perturbation results of retro Banach frames and an almost exact retro Banach frames for Banach spaces. [ABSTRACT FROM AUTHOR]