2-Local derivations on matrix algebras and algebras of measurable operators

Abstract: Let (\mathcal{A}) be a unital Banach algebra such that any Jordan derivation from (\mathcal{A}) into any (\mathcal{A})-bimodule (\mathcal{M}) is a derivation. We prove that any 2-local derivation from the algebra $M_n(\mathcal{A})$ into $M_n(\mathcal{M})$ $(n\geq 3)$ is a derivation. We apply this result to show that any 2-local derivation on the algebra of locally measurable operators affiliated with a von Neumann algebra without direct abelian summands is a derivation.