Geodesic
On extremal and perfect σ-algebras for flows
Studia Mathematica, Tome 129 (1998) no. 2, pp. 179-183 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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It is shown that there exists a flow on a Lebesgue space with finite entropy and an extremal σ-algebra of it which is not perfect. 
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     title = {On extremal and perfect \ensuremath{\sigma}-algebras for flows},
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B. Kamiński;  . On extremal and perfect σ-algebras for flows. Studia Mathematica, Tome 129 (1998) no. 2, pp. 179-183. doi: 10.4064/sm-129-2-179-183

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