Minimization of divergences on sets of signed measures

Details Minimization of divergences on sets of signed measures Minimization of divergences on sets of signed measures

2010-03-29

arxiv.org/abs/1003.5457v1

Mathematics

Probability

Scientific paper

We consider the minimization problem of $\phi$-divergences between a given probability measure $P$ and subsets $\Omega$ of the vector space $\mathcal{M}_\mathcal{F}$ of all signed finite measures which integrate a given class $\mathcal{F}$ of bounded or unbounded measurable functions. The vector space $\mathcal{M}_\mathcal{F}$ is endowed with the weak topology induced by the class $\mathcal{F}\cup \mathcal{B}_b$ where $\mathcal{B}_b$ is the class of all bounded measurable functions. We treat the problems of existence and characterization of the $\phi$-projections of $P$ on $\Omega$. We consider also the dual equality and the dual attainment problems when $\Omega$ is defined by linear constraints.

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