Let \(N=\{1,\ldots,n\}\) be the set of claimants, \(E\ge 0\) the endowment to be divided and \(d\in \mathbb{R}_+^N\) the vector of claims
such that \(\sum_{i \in N} d_i\ge E\).
The average rule (AV) is the average of constrained equal awards (CEA) and constrained equal losses (CEL) rules.
That is,
$$ \text{AV}(E,d)=\frac{\text{CEA}(E,d)+\text{CEL}(E,d)}{2}.$$