Document Type : Original Article


Department of Mathematics, Alagappa University, Karaikudi-630 003, India


The following is the question form of Kaplansky conjecture of 1958. Is every derivation on semisimple Banach algebra continuous? Kaplansky conjecture was proved by Johnson and Sinclair in 1968. The concept of almost Jordan derivations on Jordan Banach algebras is introduced in this article. Also, Kaplansky conjecture is extended to Jordan Banach algebras as an open question: Is every almost Jordan derivations on semisimple Jordan Banach algebras continuous?. Moreover, a partial answer to this open question is derived in the sense that every almost Jordan derivation $T$ on semisimple special Jordan Banach algebras $\Omega^{+}$, with an additional condition on $\Omega^{+}$, is continuous.