Abstract
If $G$ is a locally compact group, then for each derivation $D$ from $L^1(G)$ into $L^1(G)$ there is a bounded measure $\mu\in M(G)$ with $D(a)=a*\mu-\mu*a$ for $a\in L^1(G)$ (“derivation problem” of B. E. Johnson).
If $G$ is a locally compact group, then for each derivation $D$ from $L^1(G)$ into $L^1(G)$ there is a bounded measure $\mu\in M(G)$ with $D(a)=a*\mu-\mu*a$ for $a\in L^1(G)$ (“derivation problem” of B. E. Johnson).
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