Automatic complexity of shift register sequences

30 Jan 2020  ·  Kjos-Hanssen Bjørn ·

Let $x$ be an $m$-sequence, a maximal length sequence produced by a linear feedback shift register. We show that $x$ has maximal subword complexity function in the sense of Allouche and Shallit... We show that this implies that the nondeterministic automatic complexity $A_N(x)$ is close to maximal: $n/2-A_N(x)=O(\log^2n)$, where $n$ is the length of $x$. In contrast, Hyde has shown $A_N(y)\le n/2+1$ for all sequences $y$ of length $n$. read more

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Formal Languages and Automata Theory Combinatorics

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