Abstract

This chapter explains the concept of log-convex sets of random variables. It presents an assumption where if F is a nonempty set of random variables that are defined on the same probability space, then each random variable in F would become finite expectation. A set F can arise naturally, for example, in the context of a type of constrained extremum problem of information theory. However, in such a context it is uncertain whether F satisfies the property that there exists a unique random variable. The chapter presents a theorem where F is a nonempty set of random variables defined on the same probability space, each of which has finite expectation. If F is log-convex and that B(F) > -∞. Then, up to almost sure equivalence, there is a unique Y* in the L1 closure of F such that EY* = B(F).

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