2 problems

Let $v:2^{\mathcal G}\to\mathbb R$ be a valuation, and define the merging operation (or convolution) of valuations $v_1,v_2$ by … An $M^\natural$-concave valuation is a valuation i…

Let $v:2^{\mathcal G}\to\mathbb R$ be a valuation. An endowment operation with respect to $T\subseteq\mathcal G$ produces the valuation $v'(X)=v(X\cup T)-v(T)$, and a Rado minor va…