### Abstract

Original language | English |
---|---|

Place of Publication | Enschede |

Publisher | University of Twente |

Number of pages | 14 |

Publication status | Published - 10 Aug 2000 |

### Keywords

- METIS-119095

### Cite this

*Randomised Mutual Search*. Enschede: University of Twente.

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**Randomised Mutual Search.** / Hoepman, J.H.

Research output: Working paper › Professional

TY - UNPB

T1 - Randomised Mutual Search

AU - Hoepman, J.H.

PY - 2000/8/10

Y1 - 2000/8/10

N2 - We study the efficiency of randomised solutions to the mutual search problem of finding k agents distributed over n nodes. For a restricted class of so-called linear randomised mutual search algorithms we derive a lower bound of k−1 k+1 (n+1) expected calls in the worst case. A randomised algorithm in the shared-coins model matching this bound is also presented. Finally we show that in general more adaptive randomized mutual algorithms perform better (using k−1+k−1k+1− k−2n(n−k) worst case expected calls in the shared coins model) than the lower bound for the restricted case, even when given only private coins. A lower bound of k − 1 + n−k k+1 for this case is also derived.

AB - We study the efficiency of randomised solutions to the mutual search problem of finding k agents distributed over n nodes. For a restricted class of so-called linear randomised mutual search algorithms we derive a lower bound of k−1 k+1 (n+1) expected calls in the worst case. A randomised algorithm in the shared-coins model matching this bound is also presented. Finally we show that in general more adaptive randomized mutual algorithms perform better (using k−1+k−1k+1− k−2n(n−k) worst case expected calls in the shared coins model) than the lower bound for the restricted case, even when given only private coins. A lower bound of k − 1 + n−k k+1 for this case is also derived.

KW - METIS-119095

M3 - Working paper

BT - Randomised Mutual Search

PB - University of Twente

CY - Enschede

ER -