Combinatorial and Geometric Group Theory: Dortmund and by Oleg Bogopolski, Inna Bumagin, Olga Kharlampovich, Enric

By Oleg Bogopolski, Inna Bumagin, Olga Kharlampovich, Enric Ventura

This quantity assembles a number of study papers in all components of geometric and combinatorial team idea originated within the contemporary meetings in Dortmund and Ottawa in 2007. It comprises prime quality refereed articles developping new facets of those sleek and energetic fields in arithmetic. it's also applicable to complex scholars drawn to fresh effects at a learn point.

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Since w represents the identity, we have wk = φ(wk−1 ). We call wi the ith slice of w. The number k is the duration D(w) of the hallway. Figure 2 illustrates these notions. uk−1 u1 wk wi w0 k vk−1 v1 v2 Figure 2. A hallway. We say that the instances of letters of Fn that occur in the spelling of w are visible. 1 states that if w is a smooth hallway, then the length of each wi is bounded by a constant multiple of the number of visible edges in w. The following examples illustrate the main issues that arise in the proof.

2. Let w0 be a word from the list am , bam b−1 , cam c−1 , for some integer m. Then φ(w0 ) = w0 , so that the length of any slice of the hallway t−k w0 tk w0−1 is the same as the length of w0 . Now, let w0 be a word from the list bam , cam , cam b−1 . If m ≥ 0, then |φk+1 (w0 )| = |φk (w0 )|+1 for any k ≥ 0. If m < 0, then |φk+1 (w0 )| = |φk (w0 )| − 1 for 0 ≤ k < −m (Figure 3). Hence, the length of each slice of the hallway t−k w0 tk φk (w0−1 ) is bounded by the number of visible letters. b b a3 a 2 c c Figure 3.

Now, assume that Hr is an exponentially growing stratum. A slice ρi decomposes into r-legal subpaths with r-illegal turns in between. 1, a subpath whose r-length is greater than Cr (Equation 2) will eventually be accounted for by visible edges since it will not be shortened by cancellation within slices. Edges in Hr whose r-distance from an illegal turn is less than C2r may cancel eventually, and ρi contains at most Cr of them per r-illegal turn, so that we only need to find a bound of the number of r-illegal turns in terms of the number of visible edges.

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