Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with M. Ghaffari, A. Steger and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Tuesday, June 28, 2011, 12:15 pm

Duration: This information is not available in the database

Location: CAB G51

Speaker: Andrea Francke

A Metric Embedding: Ulam Metric into l_1

During the last two decades or so, low-distortion embeddings became recognized as a useful toolkit for designing efficient algorithms [Indyk '01]. A project that has received considerable attention is to embed the edit distance metric into the normed space l_1. A subcase of this is to consider the Ulam metric, that is, the metric space of all permutations of length n together with the edit distance, and to embed it into l_1. Krauthgamer and Charikar have shown in 2006 that this is possible with distortion O(log n), which is close to optimal. After a brief introduction on metric embeddings, I will present their embedding and parts of the analysis as a nice example for a metric embedding with surprising connections to elements from the analysis of randomized quicksort, as prominently featured in the "Algorithms, Probability and Computing" course.

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