Loeb extension and Loeb equivalence

Loeb extension and Loeb equivalence

In [J. London Math. Soc. 69 (2004), pp. 258-272] Keisler and Sun leave open several questions regarding Loeb equivalence between internal probability spaces; specifically, whether under certain conditions, the Loeb measure construction applied to two such spaces gives rise to the same measure. We pr...

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Veröffentlicht in:Proceedings of the American Mathematical Society. Series B 2021-03, Vol.8 (10), p.112-120
Hauptverfasser: Anderson, Robert, Duanmu, Haosui, Schrittesser, David, Weiss, William
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Duanmu, Haosui
Schrittesser, David
Weiss, William
description In [J. London Math. Soc. 69 (2004), pp. 258-272] Keisler and Sun leave open several questions regarding Loeb equivalence between internal probability spaces; specifically, whether under certain conditions, the Loeb measure construction applied to two such spaces gives rise to the same measure. We present answers to two of these questions, by giving two examples of probability spaces. Moreover, we reduce their third question to the following: Is the internal algebra generated by the union of two Loeb equivalent internal algebras a subset of their common Loeb extension? We also present a sufficient condition for a positive answer to this question.
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