Abstract
Let G be a k-transitive permutation set on E and let E* = E∪{∞},∞ ∉ E; if G* is a (k: + 1)-transitive permutation set on E*, G* is said to be an extension of G whenever G *∝ =G. In this work we deal with the problem of extending (sharply) k- transitive permutation sets into (sharply) (k + 1)-transitive permutation sets. In particular we give sufficient conditions for the extension of such sets; these conditions can be reduced to a unique one (which is a necessary condition too) whenever the considered set is a group. Furthermore we establish necessary and sufficient conditions for a sharply k- transitive permutation set (k ≥ 3) to be a group. Math. Subj. Class.: 20B20 Multiply finite transitive permutation groups 20B22 Multiply infinite transitive permutation groups
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Work done under the auspicies of G.N.S.A.G.A. supported by 40% giants of M.U.R.S.T. and by Fondi per la Ricerca Scientifica Università di Modena.
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Rinaldi, G., Spaggiari, S. Extension of Multiply Transitive Permutation Sets. Results. Math. 32, 95–99 (1997). https://doi.org/10.1007/BF03322529
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DOI: https://doi.org/10.1007/BF03322529