Déformations de courbes avec action de groupe II.
Stéphane Tufféry (1996)
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Stéphane Tufféry (1996)
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D.W. Hardy, M. Thornton (1981)
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M. Petrich (1974)
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W. Ruppert (1984)
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A. Zajtz (1972)
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B.M. Schein (1985)
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Hidalgo, Rubén A. (1994)
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Martin R. Bridson (2011)
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We consider actions of automorphism groups of free groups by semisimple isometries on complete CAT(0) spaces. If n ≥ 4 then each of the Nielsen generators of Aut(Fₙ) has a fixed point. If n = 3 then either each of the Nielsen generators has a fixed point, or else they are hyperbolic and each Nielsen-generated ℤ⁴ ⊂ Aut(F₃) leaves invariant an isometrically embedded copy of Euclidean 3-space 𝔼³ ↪ X on which it acts as a discrete group of translations with the rhombic dodecahedron...
Rakhimov, A.A. (2004)
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Giovanni Cutolo (1992)
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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.
L. Varecza (1979)
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B. Castellano (1983)
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