Equation 21.5.5D38381F0AC43

\begin{equation} \operatorname {MA}_{\mathbb R}(F_1,\ldots ,F_ n)=\frac1{n!}\sum _{J\subset \{ 1,\ldots ,n\} } (-1)^{n-|J|}\operatorname {MA}_{\mathbb R} \left(\sum _{j\in J}F_ j\right), \end{equation}