Automorphisms of differential groups
A. Zajtz (1972)
Colloquium Mathematicae
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A. Zajtz (1972)
Colloquium Mathematicae
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Hidalgo, Rubén A. (1994)
Annales Academiae Scientiarum Fennicae. Series A I. Mathematica
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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.
Giovanni Cutolo (2006)
Rendiconti del Seminario Matematico della Università di Padova
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Donald J. Collins (1989)
Commentarii mathematici Helvetici
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Karen Vogtmann, Sava Krstic (1993)
Commentarii mathematici Helvetici
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Eric Bedford, Jiri Dadok (1987)
Commentarii mathematici Helvetici
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S.A. Huq (1972)
Publications de l'Institut Mathématique [Elektronische Ressource]
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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...
Klaus Schmidt, Tom Ward (1993)
Inventiones mathematicae
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Hans Liebeck, Desmond MacHale (1972)
Mathematische Zeitschrift
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