English

Ternary derivations of nest algebras

Operator Algebras 2020-01-03 v1

Abstract

Suppose that XX is a (real or complex) Banach space, dimX2dimX \geq 2, and N\mathcal{N} is a nest on XX, with each NN in N\mathcal{N} is complemented in XX whenever N=NN_{-}=N. A ternary derivation of AlgNAlg\mathcal{N} is a triple of linear maps (γ,δ,τ)(\gamma, \delta, \tau) of AlgNAlg\mathcal{N} such that γ(AB)=δ(A)B+Aτ(B)\gamma(AB)=\delta(A)B +A\tau(B) for all A,BAlgNA,B \in Alg\mathcal{N}. We show that for linear maps δ\delta, τ\tau on AlgNAlg\mathcal{N} there exists a unique linear map γ\gamma from AlgNAlg\mathcal{N} into AlgNAlg\mathcal{N} defined by γ(A)=RA+AT\gamma(A)=RA+AT for some RR, TT in AlgNAlg\mathcal{N} such that (γ,δ,τ)(\gamma, \delta, \tau) is a ternary derivation of AlgNAlg\mathcal{N} if and only if δ\delta, τ\tau satisfy δ(A)B+Aτ(B)=0\delta(A)B+A\tau(B)=0 for any AA,BB in AlgNAlg\mathcal{N} with AB=0AB=0. We also prove that every ternary derivation on AlgNAlg\mathcal{N} is an inner ternary derivation. Our results are applied to characterize the (right or left) centralizers and derivations through zero products, local right (left) centralizers, right (left) ideal preserving maps and local derivations on nest algebras.

Keywords

Cite

@article{arxiv.2001.00201,
  title  = {Ternary derivations of nest algebras},
  author = {Hoger Ghahramani},
  journal= {arXiv preprint arXiv:2001.00201},
  year   = {2020}
}