Geodesic
On extremal and perfect σ-algebras for $ℤ^{d}$-actions on a Lebesgue space
Studia Mathematica, Tome 124 (1997) no. 2, pp. 173-178 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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We show that for every positive integer d there exists a $ℤ^d$-action and an extremal σ-algebra of it which is not perfect. 
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     title = {On extremal and perfect \ensuremath{\sigma}-algebras for $\ensuremath{\mathbb{Z}}^{d}$-actions on a {Lebesgue} space},
     journal = {Studia Mathematica},
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B. Kamiński;  ;  . On extremal and perfect σ-algebras for $ℤ^{d}$-actions on a Lebesgue space. Studia Mathematica, Tome 124 (1997) no. 2, pp. 173-178. doi: 10.4064/sm-124-2-173-178

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