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A bilingual QIK-VRT working paper defining proof closure as the terminal meta-condition for one exactly bound subject: all required proofs valid, provenance bound, verifiers checked, fresh independent readback accepted, boundaries explicit, no open obligations, subject unchanged, and no predecessor-evidence transfer. The bundle explicitly distinguishes closure from universal truth and from the halting problem.
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Ingolf Lohmann (2026) studied this question.
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