A Lower Bound for Read-Once-Only Branching Programs

L. Babai,P. Hajnal,E. Szemerédi,György Turán

Published 1987 in Journal of computer and system sciences (Print)

ABSTRACT

Abstract We give a C n lower bound for read-once-only branching programs computing an explicit Boolean function. For n = ( 2 ν , the function computes the parity of the number of triangles in a graph on ν vertices. This improves previous exp ( c √ n )) lower bounds for other graph functions by Wegener and Zak. The result implies a linear lower bound for the space complexity of this Boolean function on “eraser machines,” i.e., machines that erase each input bit immediately after having read it.

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