Theory₂₀OperationalAdmissibility-and-the-iron-lawsᵥ1ITAYPRIIZ

Abstract This note formulates three constraint-level principles—irreversibility, locality, and the absence of static equilibrium—as admissibility conditions for physically meaningful descriptions available to internal observers. Rather than proposing new dynamics, these “Iron Laws” function as structural filters: any candidate account of reality must remain horizon-bounded, thermodynamically directional, and capable of phase change. The irreversibility constraint asserts that stable knowledge and classical predictability arise only within processes that produce entropy, rendering globally reversible descriptions operationally inaccessible even if mathematically well-defined. The locality constraint restricts physically grounded correlations to finite causal structure, limiting the explanatory role of global constructions. The non-static condition requires persistent non-equilibrium, ensuring that structure formation, reconfiguration, and information flow remain physically possible. Taken together, these principles demote a broad class of globally complete or equilibrium-based frameworks from operational physics to mathematical idealization without disputing their formal validity. The result is a minimal admissibility architecture intended to clarify which theoretical descriptions can, in principle, ground observer-accessible reality. These laws are proposed not as derived theorems but as constraint-level necessities suggested by thermodynamics, causal structure, and the conditions required for stable observers. Their role is therefore diagnostic rather than constructive: to delineate the boundary between physically operative accounts and descriptions that cannot be realized within a finite horizon. The locality constraint introduced here is not taken as primitive, but can be derived from the Persistent Uncertainty Law under finite record admissibility conditions, as shown in a companion addendum.