On some Lie automorphisms of a class of Kadison-Singer algebras
Let $\mathcal{H}$ be an infinite dimensional separable Hilbert space and $\mathcal{N}$ a nest of projections on $\mathcal{H}$ with at least four projections. Let $ξ$ be a separating vector of $\mathcal{N}^{''}$ and $P_ξ$ the orthogonal projection from $\mathcal{H}$ onto the one-dimensional subspace of $\mathcal{H}$ generated by $ξ$. Let $\mathcal{L}$ be the lattice generated by $\mathcal{N}$ and $P_ξ$, and ${\rm{Alg}}\mathcal{L}$ the corresponding Kadison-Singer algebra. In this note, we show that every Lie automorphism $ψ$ on ${\rm{Alg}}\mathcal{L}$ can be decomposed as $ψ=ε+τ$ when $I_{-}^{\mathcal{N}}\vee P_ξ<I$, where $ε$ is an automorphism and $τ$ is a linear functional $τ$ on ${\rm{Alg}}\mathcal{L}$ vanishing on each commutator. For the complementary case, where $I_{-}^{\mathcal{N}}<I$ with $I_{-}^{\mathcal{N}}\vee P_ξ=I$, we also give a construction of the Lie automorphism.