Results on automorphisms of recursively saturated models of PA
Roman Kossak, Henryk Kotlarski (1988)
Fundamenta Mathematicae
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Displaying similar documents to “The number of automorphisms of models of -categorical theories”
Results on automorphisms of recursively saturated models of PA
Classes of models and sets of sentences with the intersection property
Michael O. Rabin (1962)
Annales scientifiques de l'Université de Clermont. Mathématiques
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The automorphism group of some semigroups
Richard Byrd, Justin Lloyd, Franklin Pederson, James Stepp (1984)
Fundamenta Mathematicae
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Non-trivial homeomorphisms of βNNwithout the continuum hypothesis
Saharon Shelah, Juris Steprans (1989)
Fundamenta Mathematicae
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On the automorphism group of the countable dense circular order
J. K. Truss (2009)
Fundamenta Mathematicae
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Let (C,R) be the countable dense circular ordering, and G its automorphism group. It is shown that certain properties of group elements are first order definable in G, and these results are used to reconstruct C inside G, and to demonstrate that its outer automorphism group has order 2. Similar statements hold for the completion C̅.
Remarks on countable models
Miroslav Benda (1974)
Fundamenta Mathematicae
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On automorphisms of algebras with a single unary operation
Fuhrken, G. (1973)
Portugaliae mathematica
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Automorphisms of -groups with cyclic commutator subgroup
Federico Menegazzo (1993)
Rendiconti del Seminario Matematico della Università di Padova
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A note on central automorphisms of groups
Giovanni Cutolo (1992)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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A characterization of central automorphisms of groups is given. As an application, we obtain a new proof of the centrality of power automorphisms.
Tame Automorphisms of ℂ³ with Multidegree of the Form (p₁,p₂,d₃)
Marek Karaś (2011)
Bulletin of the Polish Academy of Sciences. Mathematics
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Let d₃ ≥ p₂ > p₁ ≥ 3 be integers such that p₁,p₂ are prime numbers. We show that the sequence (p₁,p₂,d₃) is the multidegree of some tame automorphism of ℂ³ if and only if d₃ ∈ p₁ℕ + p₂ℕ, i.e. if and only if d₃ is a linear combination of p₁ and p₂ with coefficients in ℕ.
Notes on automorphisms of ultrapowers of II₁ factors
David Sherman (2009)
Studia Mathematica
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In functional analysis, approximative properties of an object become precise in its ultrapower. We discuss this idea and its consequences for automorphisms of II₁ factors. Here are some sample results: (1) an automorphism is approximately inner if and only if its ultrapower is ℵ₀-locally inner; (2) the ultrapower of an outer automorphism is always outer; (3) for unital *-homomorphisms from a separable nuclear C*-algebra into an ultrapower of a II₁ factor, equality of the induced traces...