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The convex set of distributions maintained by an agent is called
the agent's credal set, and its existence is postulated on the grounds
of axioms about preferences [14].2 To simplify terminology,
the term credal set is used only when it refers to a set of
distributions containing more than one element. A closed convex set of joint
distributions is called a joint credal set.
This paper deals with credal sets that are defined as the convex hull
of a finite number of probability distributions; such finitely
generated credal sets are polytopes in the space of probability distributions.
Fabio Gagliardi Cozman
1998-07-03