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Simplicial structures on train tracks

Plan of the talk. Braid groupsCrossed simplicial structureFree groups and simplicial group structure on free groupsCombinatorial description of mapping classesSimplicial structure on train tracks. Braid groups. A braid is: n descending strands joins {(i/(n-1),0,1)} to {(i/(n-1),0,0)} the str

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Simplicial structures on train tracks

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