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A note on fixed points of automorphisms of infinite groups | ||
International Journal of Group Theory | ||
مقاله 8، دوره 3، شماره 4، اسفند 2014، صفحه 57-61 اصل مقاله (259.93 K) | ||
نوع مقاله: Research Paper | ||
شناسه دیجیتال (DOI): 10.22108/ijgt.2014.5342 | ||
نویسندگان | ||
Francesco de Giovanni* 1؛ Martin L. Newell2؛ Alessio Russo3 | ||
1University of Napoli Federico II | ||
2National University of Ireland | ||
3Seconda Universita di Napoli | ||
چکیده | ||
Motivated by a celebrated theorem of Schur, we show that if $\Gamma$ is a normal subgroup of the full automorphism group $Aut(G)$ of a group $G$ such that $Inn(G)$ is contained in $\Gamma$ and $Aut(G)/\Gamma$ has no uncountable abelian subgroups of prime exponent, then $[G,\Gamma]$ is finite, provided that the subgroup consisting of all elements of $G$ fixed by $\Gamma$ has finite index. Some applications of this result are also given. | ||
کلیدواژهها | ||
automorphism group؛ Schur's theorem؛ absolute centre | ||
مراجع | ||
R. Baer (1952) Endlichkeitskriterien f\"ur Kommutatorgruppen Math. Ann. 124, 161-177
H. Dietrich and P. Moravec (2011) On the autocommutator subgroup and absolute centre of a group J. Algebra 341, 150-157
S. Franciosi and F. de Giovanni (1986) A note on groups with countable automorphism groups Arch. Math. (Basel) 47, 12-16
P. Hegarty (1994) The absolute centre of a group J. Algebra 169, 929-935
D. J. S. Robinson (1972) Finiteness Conditions and Generalized Soluble Groups Springer, Berlin
I. Schur (1904) \"Uber die Darstellung der endlichen Gruppen durch gebrochene linear Substitutionen J. Reine Angew. Math. 127, 20-50
R. F. Turner Smith (1964) Marginal subgroup properties for outer commutator words Proc. London Math. Soc. (3) 14, 321-341
D. J. S. Robinson (1979) Infinite torsion groups as automorphism groups Quart. J. Math. Oxford Ser. (2) 30, 351-364
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