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On Approximability of Boolean Formula Minimization
Authors:Oleg A. Prokopyev  Panos M. Pardalos
Affiliation:(1) Department of Industrial and Systems Engineering, University of Florida, Gainesvillw, 32611, FL, USA
Abstract:
For a Boolean function 
$$f:left{ {0,1} right}^n  to left{ {0,1} right}$$
given by a Boolean formula (or a binary circuit) S we discuss the problem of building a Boolean formula (binary circuit) of minimal size, which computes the function g equivalent to 
$$f$$
, or isin-equivalent to 
$$f$$
, i.e., 
$$Pr_{x in left{ {0,1} right}^n } left{ {gleft( x right) ne fleft( x right)} right} leqslant varepsilon $$
. In this paper we prove that if P ne NP then this problem can not be approximated with a ldquogoodrdquo approximation ratio by a polynomial time algorithm.
Keywords:minimum formula size problem  minimum circuit size problem  approximation  Boolean circuits  Boolean formulas  inapproximability  combinatorial optimization
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