User:IssaRice/Shapley value

most expositions of the Shapley value SUCK BALLS because they try to sum over the subsets excluding the playing in question (usually called "player i"). so here we go, here's a TRUE REDPILLED exposition of the shapley value!

the Shapley value is ${\frac {1}{|\mathrm {Sym} (n)|}}\sum _{\sigma \in \mathrm {Sym} (n)}f_{i}(\sigma (1),\ldots ,\sigma (n))$