All-derivable points of operator algebras☆
All-derivable points of operator algebras☆
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DOI:
10.1016/j.laa.2007.05.049
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发表时间:
2007-11
影响因子:
1.1
通讯作者:
Jun Zhu
中科院分区:
文献类型:
--
作者:
Jun Zhu
Let A be an operator subalgebra in B(H), where H is a Hilbert space. We say that an element Z∈A is an all-derivable point of A for the norm-topology (strongly operator topology, etc.) if, every norm-topology (strongly operator topology, etc.) continuous derivable linear mapping φ at Z (i.e. φ(ST)=φ(S)T+Sφ(T) for any S,T∈A with ST=Z) is a derivation. In this paper, we show that every invertible operator in the nest algebra algN is an all-derivable point of the nest algebra for the strongly operator topology. We also prove that every nonzero element of the algebra of all 2×2 upper triangular matrixes is an all-derivable point of the algebra.