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arXiv · 1910.01908

Symbolic dynamics and rotation symmetric Boolean functions

Alexandru Chirvasitu·Thomas Cusick
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Abstract

We identify the weights $wt(f_n)$ of a family $\{f_n\}$ of rotation symmetric Boolean functions with the cardinalities of the sets of $n$-periodic points of a finite-type shift, recovering the second author's result that said weights satisfy a linear recurrence. Similarly, the weights of idempotent functions $f_n$ defined on finite fields can be recovered as the cardinalities of curves over those fields and hence satisfy a linear recurrence as a consequence of the rationality of curves' zeta functions. Weil's Riemann hypothesis for curves then provides additional information about $wt(f_n)$. We apply our results to the case of quadratic functions and considerably extend the results in an earlier paper of ours.

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Alexandru Chirvasitu, Thomas Cusick. 2019-09-19. Symbolic dynamics and rotation symmetric Boolean functions. https://arxiv.org/abs/1910.01908

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