On (m'n)-derivation on nest algebras

Let m , n be non-zero integers with (m+n)(m-n) 10, AlgΝ be a nest algebra and δ be a selfmap on AlgΝ. This paper shows that if δ satisfies mδ(AB)+nδ(BA)=mδ(A)B+mAδ(B)+nδ(B)A+nBδ(A) for all A,B? AlgΝ,then δis an additive derivation.