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OP-6817Status unassessedAlgorithms and data structures

The Strong Sensitivity Conjecture

TheoremDB P8658 · Candidate awaiting source review

Inferred from the community field; finer classification has not been reviewed.

Source candidate · not reviewedAs of 2026-09-08Source & evidence ↓

Problem statement

Let nn be a natural number. A Boolean function on nn variables is a function f:{0,1}n→{0,1}f : \{0,1\}^n \to \{0,1\}. For x∈{0,1}nx \in \{0,1\}^n and B⊆{1,…,n}B \subseteq \{1, \ldots, n\}, let flip⁡(x,B)\operatorname{flip}(x, B) denote the element of {0,1}n\{0,1\}^n obtained from xx by flipping all bits whose indices lie in BB. The local sensitivity of ff at xx, denoted s(f,x)s(f, x), is the number of indices i∈{1,…,n}i \in \{1, \ldots, n\} such that f(flip⁡(x,{i}))≠f(x)f(\operatorname{flip}(x, \{i\})) \neq f(x). The sensitivity of ff, denoted s(f)s(f), is the maximum of s(f,x)s(f, x) over all x∈{0,1}nx \in \{0,1\}^n. A collection B\mathcal{B} of nonempty subsets of {1,…,n}\{1, \ldots, n\} is called a valid block configuration for ff at xx if the sets in B\mathcal{B} are pairwise disjoint and f(flip⁡(x,B))≠f(x)f(\operatorname{flip}(x, B)) \neq f(x) for every B∈BB \in \mathcal{B}. The local block sensitivity of ff at xx, denoted bs⁡(f,x)\operatorname{bs}(f, x), is the maximum cardinality of a valid block configuration for ff at xx. The block sensitivity of ff, denoted bs⁡(f)\operatorname{bs}(f), is the maximum of bs⁡(f,x)\operatorname{bs}(f, x) over all x∈{0,1}nx \in \{0,1\}^n. Does bs⁡(f)≤s(f)2\operatorname{bs}(f) \leq s(f)^2 hold for every Boolean function ff on nn variables?

Lean 4

No Lean submitted

Formal statement

Lean 4
theorem strong_sensitivity_conjecture {n : ℕ} (f : (Fin n → Bool) → Bool) :
    blockSensitivity f ≤ sensitivity f ^ 2

On-site verification needs an executable Lean target. None is attached yet.

A source attachment or link is not a verified proof. The statement’s correspondence with the original question needs human review.

Proofs & verification

No Lean has been submitted for this problem yet. A Lean file can be attached to a submission for review, though with no target here it cannot be machine-checked.

Progress & source assessment

Source-reported assessment, retrieved 8 September 2026. Frontier Science has not independently reviewed this status.

Open. No signed Lean verification is attached to this problem or its selected resolution.

This record is in the source backlog; its novelty and unresolved status have not passed source review.

References
  1. [1]TheoremDB P8658 link
  2. [2]Source formal statement (not locally verified) link

Recorded progress

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Discussion

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