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VON NEUMANN'S PROBLEM AND LARGE CARDINALS

  • ILIJAS FARAH (a1) and BOBAN VELIČKOVIĆ (a2)

Abstract

It is a well-known problem of Von Neumann to discover whether the countable chain condition and weak distributivity of a complete Boolean algebra imply that it carries a strictly positive probability measure. It was shown recently by Balcar, Jech and Pazák, and by Veličković, that it is consistent with ZFC, modulo the consistency of a supercompact cardinal, that every ccc weakly distributive complete Boolean algebra carries a contiuous strictly positive submeasure – that is, it is a Maharam algebra. We use some ideas of Gitik and Shelah and implications from the inner model theory to show that some large cardinal assumptions are necessary for this result.

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VON NEUMANN'S PROBLEM AND LARGE CARDINALS

  • ILIJAS FARAH (a1) and BOBAN VELIČKOVIĆ (a2)

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