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Capped Power Invariant

The capped power invariant is the trading invariant vital to PMMP. It was introduced in a research paper called Replicating Monotonic Payoffs Without Oracles.
φ(R1,R2)=R1(p112R2)2\varphi(R_{1}, R_{2}) = R_{1}-\left(p_{1}-\frac{1}{2}R_{2}\right)^{2}