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  • On the limits of gate elimi...
    Golovnev, Alexander; Hirsch, Edward A.; Knop, Alexander; Kulikov, Alexander S.

    Journal of computer and system sciences, September 2018, 2018-09-00, Letnik: 96
    Journal Article

    Although a simple counting argument shows the existence of Boolean functions of exponential circuit complexity, proving superlinear circuit lower bounds for explicit functions seems to be out of reach of the current techniques. There has been a (very slow) progress in proving linear lower bounds with the latest record of 3186n−o(n). All known lower bounds are based on the so-called gate elimination technique. A typical gate elimination argument shows that it is possible to eliminate several gates from a circuit by making one or several substitutions to the input variables and repeats this inductively. In this paper we prove that this method cannot achieve linear bounds of cn beyond a certain constant c, where c depends only on the number of substitutions made at a single step of the induction. •Gate elimination with O(1) circuit complexity decrease only proves O(n) lower bounds.•Circuit complexity is reduced by O(1) after O(1) arbitrary substitutions.•Subadditive complexity is reduced by O(1) after O(1) arbitrary substitutions.•Gate elimination counting gates and inputs cannot prove a bound of cn for explicit c.