Abstract
Let A be an algebra. By a derivation of A we mean a linear mapping δ:D(δ)→A (D(δ) being a subalgebra of A) such that δ(ab) = =aδ(b)+δ(a)b for all a,bεD(δ). A derivation δ of A is said to be inner if there exists aOεA such that δ(a)=aOa−aaO (=ad(aO) (a)) for all aεD(δ). If A is a *-algebra, a derivation δ:D(δ)→A is called symmetric if a) D(δ) is a *-subalgebra of A, and b)δ (a*)=δ(a)* for all aεD(δ).
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Peligrad, C. (1981). Derivations of C*-Algebras which Are Invariant Under an Automorphism Group. In: Apostol, C., Douglas, R.G., Nagy, B.S., Voiculescu, D., Arsene, G. (eds) Topics in Modern Operator Theory. Operator Theory: Advances and Applications, vol 2. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-5456-6_16
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DOI: https://doi.org/10.1007/978-3-0348-5456-6_16
Publisher Name: Birkhäuser, Basel
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