Additive maps derivable or Jordan derivable at zero point on nest algebras
Additive maps derivable or Jordan derivable at zero point on nest algebras
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嵌套代数上零点处的加法映射可导或乔丹可导
DOI:
10.1016/j.laa.2010.01.009
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发表时间:
2010-06
影响因子:
1.1
通讯作者:
中科院分区:
文献类型:
--
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Let AlgN be a nest algebra associated with the nest N on a (real or complex) Banach space X. Assume that every N∈N is complemented whenever N-=N. Let δ:AlgN→AlgN be an additive map. It is shown that the following three conditions are equivalent: (1) δ is derivable at zero point, i.e., δ(AB)=δ(A)B+Aδ(B) whenever AB=0; (2) δ is Jordan derivable at zero point, i.e., δ(AB+BA)=δ(A)B+Aδ(B)+Bδ(A)+δ(B)A whenever AB+BA=0; (3) δ has the form δ(A)=τ(A)+cA for some additive derivation τ and some scalar c. It is also shown that δ is generalized derivable at zero point, i.e., δ(AB)=δ(A)B+Aδ(B)-Aδ(I)B whenever AB=0, if and only if δ is an additive generalized derivation. Finer characterizations of above maps are given for the case dimX=∞.
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