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%% In fact, if $\mathfrak A$ is a C*--algebra
%%and $\hslash \in \bR/{0}$, then $\mathfrak A^{sa}$ is a JLB--algebra when it %%%takes its norm from $\mathfrak A$, with $k= \hslash$, and is equipped with
%%the operations~:
%%$\begin{aligned} S \circ T &:= \frac{1}{2}{(ST + TS)} ~,{\left\{S,T\right\}}_k
%%&:={\frac{\iota}}_k \times {[S,T]} ~.\end{aligned}$
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