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A Ramsey-type theorem for metric spaces and its applications for metrical task systems and related problems

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3 Author(s)
Y. Bartal ; Hebrew Univ., Jerusalem, Israel ; B. Bollobas ; M. Mendel

The paper gives a nearly logarithmic lower bound on the randomized competitive ratio for a Metrical Task Systems model (A. Borodin et al., 1992). This implies a similar lower bound for the extensively studied K-server problem. Our proof is based on proving a Ramsey-type theorem for metric spaces. In particular, we prove that in every metric space there exists a large subspace which is approximately a "hierarchically well-separated tree" (HST) (Y. Bartal, 1996). This theorem may be of independent interest.

Published in:

Foundations of Computer Science, 2001. Proceedings. 42nd IEEE Symposium on

Date of Conference:

8-11 Oct. 2001