Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X Articles in Press 2011 06 20 C-frames and c-bessel mappings en Mohammad Hasan Faroughi Islamic Azad University - Shabestar Branch Elnaz Osgooei University of Tabriz 2011 06 07 Lebesque integral Hilbert space $C^*$-algebra trace class operator frame theory