For the Shapley equation
![\begin{equation}
\phi_{i} = \sum_{S\subseteq F\backslash {i}}\dfrac{|S|!(|F| - |S| - 1)!}{|F|!}\left[f_{S\cup{i}}(x_{S\cup{i}})-f_{S}(x_{S})\right]
\end{equation}](https://i.stack.imgur.com/nWUVm.png)
How to read 
??
I know the first part says F is a subset of S, but what does the \{i} mean?
How to interpret the Shapley formula
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For the Shapley equation
How to read ??
I know the first part says F is a subset of S, but what does the \{i} mean?
We want to sum over all coalitions where agent i is not present. In this notation it is denoted by F \ {i}.
The interpretation of the Shapley value: