Abstract
The goal of this paper is to introduce a new tool, called long turns, which is a useful addition to the train track technology for automorphisms of free groups, in that it allows one to control periodic INPs in a train track map and hence the index of the induced automorphism.
Citation
Thierry Coulbois. Martin Lustig. "Long turns, INP’s and indices for free group automorphisms." Illinois J. Math. 59 (4) 1087 - 1109, Winter 2015. https://doi.org/10.1215/ijm/1488186022
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