Damien Pitman - Random 2-SAT Solution Components and a Fitness Landscape

dmtcs:534 - Discrete Mathematics & Theoretical Computer Science, June 13, 2011, Vol. 13 no. 2 - https://doi.org/10.46298/dmtcs.534
Random 2-SAT Solution Components and a Fitness Landscape

Authors: Damien Pitman

    We describe a limiting distribution for the number of connected components in the subgraph of the discrete cube induced by the satisfying assignments to a random 2-SAT formula. We show that, for the probability range where formulas are likely to be satisfied, the random number of components converges weakly (in the number of variables) to a distribution determined by a Poisson random variable. The number of satisfying assignments or solutions is known to grow exponentially in the number of variables. Thus, our result implies that exponentially many solutions are organized into a stochastically bounded number of components. We also describe an application to biological evolution; in particular, to a type of fitness landscape where satisfying assignments represent viable genotypes and connectivity of genotypes is limited by single site mutations. The biological result is that, with probability approaching 1, each viable genotype is connected by single site mutations to an exponential number of other viable genotypes while the number of viable clusters is finite.


    Volume: Vol. 13 no. 2
    Section: Graph and Algorithms
    Published on: June 13, 2011
    Accepted on: June 9, 2015
    Submitted on: September 5, 2008
    Keywords: [INFO.INFO-DM] Computer Science [cs]/Discrete Mathematics [cs.DM]
    Fundings :
      Source : OpenAIRE Research Graph
    • Deterministic and Stochastic Growth Models; Funder: National Science Foundation; Code: 0204376

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