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Definable automorphisms of $ \mathcal{P}(\omega)/\mathrm{fin}$

Author: Boban Veličković
Journal: Proc. Amer. Math. Soc. 96 (1986), 130-135
MSC: Primary 03E35; Secondary 03E15
MathSciNet review: 813825
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Abstract: We investigate definable automorphisms of $ \mathcal{P}\left( \omega \right)/{\text{fin}}$ and show that e.g. every Borel automorphism is trivial. The existence of nontrivial projective automorphisms is consistent and independent from $ {\text{ZFC + CH}}$.

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Keywords: $ \mathcal{P}\left( \omega \right)/{\text{fin}}$, trivial automorphism
Article copyright: © Copyright 1986 American Mathematical Society

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