arXiv:2610.17006 · v2

Sensitivity of Rotation Symmetric Boolean Functions via Binary Necklaces

首次提交 2026-10-12 23:51

版本更新 2026-11-08 09:34

雷达观测 2026-11-10 12:16

摘要

Rotation symmetric Boolean functions are important structured families in the theory of Boolean functions, where cyclic invariance permits compact algebraic descriptions while retaining nontrivial local behavior. We investigate their sensitivity through binary necklaces and monomial orbit sums. In the necklace quotient of the Boolean cube, ordinary adjacency does not record the number of coordinate flips: we give a directed flip-multiplicity formula involving stabilizers and distance-two near-periods, and derive exact local sensitivity formulas when the number of variables is an odd prime. For monomial rotation symmetric functions we determine sensitivity for all odd degrees and for quadratic orbit sums. For the consecutive-monomial family of every even degree $d\ge4$, we prove a run-cluster inequality and obtain the eventual exact formula $s(F_{d,n})=n-\min\{r,d+2-r\}$, where $n\equiv r\pmod{d+2}$, under the stated length hypothesis. The consecutive quartic case follows explicitly. We also evaluate sensitivity for cyclic run-threshold functions. Our results provide exact combinatorial and complexity-theoretic information about cyclic Boolean functions and clarify how cyclic symmetry governs local sensitivity.

作者备注：Version 2 29 pages