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Journal of Computer and System Sciences
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White pebbles help

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Abstract

It is proved that for infinitely many n there is a directed acyclic graph with vertex indegrees bounded by 2 that has a strategy of the black-white pebble game using n pebbles and for which any strategy of the black pebble game requires Ω(n log n/log log n) pebbles. This shows that there is a family of straight-line programs for which nondeterminism reduces the space required to evaluate the programs by more than any constant factor. © 1988.

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Journal of Computer and System Sciences

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