Manuscript OpenAI@2026-10-07 · OpenAI.tex · remark · 6a931f8f

Remark: 129-01. An exponential state lower bound for two-way nondeterministic complementation

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Authors: OpenAI. Family 129.

Title: An exponential state lower bound for two-way nondeterministic complementation.

Abstract: We prove that two-way nondeterministic finite automata cannot be complemented with a polynomial number of states independent of the alphabet. For each n ≥ 4 we construct an n-state automaton over a finite alphabet whose complement requires at least ${}tfrac12 2{}{{}lfloor(n-4)/127{}rfloor}-1$ states.

This abstract is a catalogue record. It is not a verification and not a premise. It does not close O.1. O.1 stays NOT_CLOSED. No quantum coefficient is admitted. No compilation is asserted.

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