Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X 37 No. 4 2011 12 15 Generalized sigma-derivation on Banach algebras81 94 en A. Hosseini M. Hassani A. Niknam 2010 02 28 Derivation $sigma$-derivation $(sigma d)$-derivation $sigma$-algebraic map