On the extremality of regular extensions of contents and measures
Wolfgang Adamski (1995)
Commentationes Mathematicae Universitatis Carolinae
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Let be an algebra and a lattice of subsets of a set . We show that every content on that can be approximated by in the sense of Marczewski has an extremal extension to a -regular content on the algebra generated by and . Under an additional assumption, we can also prove the existence of extremal regular measure extensions.