Automatic Continuity of Some Types of Double Derivations on Semisimple Banach Algebras
Abstract
Following Villena in [9] and Mohammed and Ali in [4], we introduce partially defined ( ) - c - double derivation and generalized ( ) - c - double derivation on a semisimple complex Banach algebra whose domain is not necessarily closed, essential ideal and we prove that they are closable. In particular, we show that every ( )- c -double derivation and generalized ( ) - c - double derivation defined on any nonzero ideal of a prime C * - algebra are continuous.
References
- derivations on C * - algebras , Proc. Amer. Math. Soc. , 134 :
- Johnson B. E. and Sinclair A. M. , Continuity of derivations anda
- Lee T K . and Liu C K . , Partially defined derivations on
- Mathieu M. , Elementary operator on prime C* - algebra , Math.
- Mohammed A. A. and Ali S. M. , On Villenas theorem of
- Mahdavian Rad H. and Niknam A. , Double derivations, higher
- Mirzavaziri M. and Moslehian M. S. , Automatic continuity of
- Mirzavaziri M. and Omidvar Tehrani E. , ( d , ) - double derivations
- Parky C. and Yun Shinz D. , Generalized ( , ) - derivations on
- Villena A. R. , Essentially defined derivations on semisimple Banach
- - 170 (2013) .
- - 3327 (2006) .
- algebras , Proc. Edinburgh Math. Soc. , 40 : 175 - 179 (1997) .
- Ann. , 284 : 223 - 244 (1989) .
- automatic continuity of essentially defined derivations on semisimple
- Banach algebras , Int. J. of Math. Analysis,7 : 2931 - 2939 (2013).
- Banach algebras , Korean J. Math. , 22 (1) : 139 - 150 (2014) .
- double derivations and automatic continuity , J. of sciences, 24 (2) :
- on C * - algebras , Bull. Iranian Math. Soc. , 35 : 147 - 154 (2009).
- problem of Kaplansky , Amer. J. Math. , 90 : 1067 - 1073 (1968) .
- semisimple Banach algebras , Studia. Math. , 190 : 193 - 202 (2009).