Mathematics – Metric Geometry
Scientific paper
2011-10-30
Mathematics
Metric Geometry
Scientific paper
The article is devoted to a proof of the optimal upper-bound for Morse Lemma, its "anti"-version and their applications. Roughly speaking, Morse Lemma states that in a hyperbolic metric space, a $\lambda$-quasi-geodesic $\gamma$ sits in a $\lambda^2$-neighborhood of every geodesic $\sigma$ with same endpoints. Anti-Morse Lemma states that $\sigma$ sits in a $\log\lambda$-neighborhood of $\gamma$. Applications include the displacement of points under quasi-isometries fixing the ideal boundary.
Shchur Vladimir
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