Abstract
The class M of finite manuals (i.e. hypergraphs formed by the cliques of finite graphs) is closed under the formation of sums and products. We define the class of constructible hypergraphs to be the smallest subclass of M which contains all finite classical manuals (i.e. hypergraphs having a single edge) and is closed under the formation of sums and products. Constructible hypergraphs have two interesting properties: (1) they do not contain hooks and (2) all their minimal transversals are supports of dispersion-free stochastic functions. Property (1) is known to characterize the constructible members of M . In this paper we show that the same holds true for property (2).
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