11.07.2015 Views

International Congress of Mathematicians

International Congress of Mathematicians

International Congress of Mathematicians

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Automorphism Groups <strong>of</strong> Saturated Structures 31non open subgroup <strong>of</strong> G al (T) <strong>of</strong> countable index (and, its preimage by the canonicalhomomorphism from Aut(M) onto Gal(T) is a non open subgroup <strong>of</strong> Aut(M) <strong>of</strong>countable index). If A has a cardinality strictly less than card(M), define AUì/A(M)as the subgroup <strong>of</strong> AUìA(M) generated by\J{Aut N (M) ; AÇN - K 0 . The smallindex property has a natural generalization. If we assume that A

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