Geodesic
Closable derivations of simple C*-algebras
Glasgow mathematical journal, Tome 24 (1983) no. 2, pp. 181-183

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In this note we show that any derivation of a simple C*-algebra, whose range is not dense, is closable. We also derive a necessary and sufficient condition for a *-derivation of a C*-algebra, which is defined on the domain of a closed *- derivation, to be closed. 
Niknam, Assadollah. Closable derivations of simple C*-algebras. Glasgow mathematical journal, Tome 24 (1983) no. 2, pp. 181-183. doi: 10.1017/S0017089500005267
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