Generalized (σ,τ) higher derivations in prime rings
Generalized (σ,τ) higher derivations in prime rings
Let R be a ring and U be a Lie ideal of R. Suppose that σ, τ are endomorphisms of R. A family D = {d n } n ∈ N of additive mappings d n :R → R is said to be a (σ,τ)- higher derivation of U into …