Convex sets, linear space of

A space whose elements are equivalence classes of pairs $(X,Y)$ of convex sets (cf. Convex set) in a locally convex linear topological space. The pair $(X,Y)$ is treated as the "difference" $X-Y$, pairs $(X_1,Y_1)$ and $(X_2,Y_2)$ being equivalent by definition if $X_1+Y_2=X_2+Y_1$, where addition of sets is understood to mean the closure of the vector sum. Addition, subtraction, multiplication by a scalar, and a topology are introduced in the space of convex sets, that space becoming thereby a locally convex topological space. Also the concept of partial ordering is introduced, which is analogous to inclusion of sets. Linear spaces of convex sets are also considered in non-locally convex linear spaces.

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