We investigate intersections of geodesic lines in and in an associated tree T, proving the following result. Let M be a punctured hyperbolic torus and let be a closed geodesic in M. Any edge of any triangle formed by distinct geodesic lines in the preimage of in is shorter then . However, a similar result does not hold in the tree T. Let W be a reduced and cyclically reduced word in . We construct several examples of triangles in T formed by distinct axes in T stabilized by conjugates of W such that an edge in those triangles is longer than L(W). We also prove that if W overlaps two of its conjugates in such a way that the overlaps cover all of W and the overlaps do not intersect, then there exists a decomposition , with B a terminal subword of C and I an initial subword of C.

生成讲解博客的中文版本

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