SΔϕ-18 — Human as the No-Arbiter Species: Provisional Institutions and Editability under Irreversibility (v1.0)

This paper provides a minimal functional definition of human within the Sofience–Δϕ Formalism by addressing the institutional reversal problem introduced in SΔϕ-17. SΔϕ-17 defined sacred/institution/law as cost devices stabilizing openness of relational futures (Ω_rel) without infinite validation cost, but raised a critical exit problem: stabilizers can reverse into coercive closure. SΔϕ-18 fixes the minimal mechanism required to detect and repair such reversal, and uses it to define “human” structurally rather than morally. Core claims: Axiom 18-0 (No external negotiator): in conflicts with the world or the other, there exists no ultimate external arbiter (¬∃ Arbiter_external). Humans are defined as systems…