Weak 2-local derivations on $\mathbb{M}_n$

TL;DR

This paper introduces the concept of weak-2-local derivations on C*-algebras and proves that such derivations on matrix algebras and finite-dimensional C*-algebras are necessarily linear derivations.

Contribution

It defines weak-2-local derivations and demonstrates they are linear derivations on matrix and finite-dimensional C*-algebras, extending understanding of derivation structures.

Findings

Weak-2-local *-derivations on M_n are linear derivations.

The same result holds for finite-dimensional C*-algebras.

Weak-2-local *-derivations are not necessarily linear in general, but are on these algebras.

Abstract

We introduce the notion of weak-2-local derivation (respectively, $^*$-derivation) on a C$^*$-algebra $A$ as a (non-necessarily linear) map $\Delta : A\to A$ satisfying that for every $a,b\in A$ and $\phi\in A^*$ there exists a derivation (respectively, a $^*$-derivation) $D_{a,b,\phi}: A\to A$, depending on $a$, $b$ and $\phi$, such that $\phi \Delta (a) = \phi D_{a,b,\phi} (a)$ and $\phi \Delta (b) = \phi D_{a,b,\phi} (b)$. We prove that every weak-2-local $^*$-derivation on $M_n$ is a linear derivation. We also show that the same conclusion remains true for weak-2-local $^*$-derivations on finite dimensional C$^*$-algebras.