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Durham University

Computer Science


Publication details for Dr Maximilien Gadouleau

Gadouleau, Maximilien, Richard, Adrien & Riis, Søren (2015). Fixed points of Boolean networks, guessing graphs, and coding theory. SIAM Journal on Discrete Mathematics 29(4): 2312-2335.

Author(s) from Durham


n this paper, we are interested in the number of fixed points of functions $f:A^n\to A^n$ over a finite alphabet $A$ defined on a given signed digraph $D$. We first use techniques from network coding to derive some lower bounds on the number of fixed points that only depends on $D$. We then discover relationships between the number of fixed points of $f$ and problems in coding theory, especially the design of codes for the asymmetric channel. Using these relationships, we derive upper and lower bounds on the number of fixed points, which significantly improve those given in the literature. We also unveil some interesting behavior of the number of fixed points of functions with a given signed digraph when the alphabet varies. We finally prove that signed digraphs with more (disjoint) positive cycles actually do not necessarily have functions with more fixed points.