J.R.Stallings, Finite graphs and free groups, Contemp. Math. 44, 1985, 79-84. Home/Search Document Not in Database Summary Related Articles |
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Surface Triangulations Without Short Noncontractible Cycles - Przytycka, Przytycki (1993) (Correct)
....subsection. We obtain a (not necessarily regular) covering of Sigma 1;1 in which at least one generalized lift of fl has complexity at least l. Finally, we construct a regular covering of Sigma 1;1 with the required property. The following theorem, which is a special case of a theorem of M. Hall [9, 3, 10, 21], will be used in the proof of the main theorem of this subsection. Since we need to refer to some facts from the proof of the theorem, for the completeness of the presentation, we give a proof of this special case. Theorem 2.15 (Hall) Let G be a finitely generated free group and w a nontrivial ....
J.R.Stallings, Finite graphs and free groups, Contemp. Math. 44, 1985, 79-84.
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