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On the Expected Depth of Random Circuits

Published online by Cambridge University Press:  01 May 1999

SUNIL ARYA
Affiliation:
Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong (e-mail: arya@cs.ust.hk)
MORDECAI J. GOLIN
Affiliation:
Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong (e-mail: golin@cs.ust.hk)
KURT MEHLHORN
Affiliation:
Max-Planck-Institut für Informatik, D-66123 Saarbrücken, Germany (e-mail: mehlhorn@mpi-sb.mpg.de)

Abstract

In this paper we analyse the expected depth of random circuits of fixed fanin f. Such circuits are built a gate at a time, with the f inputs of each new gate being chosen randomly from among the previously added gates. The depth of the new gate is defined to be one more than the maximal depth of its input gates. We show that the expected depth of a random circuit with n gates is bounded from above by ef ln n and from below by 2.04 … f ln n.

Type
Research Article
Copyright
1999 Cambridge University Press

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