This paper formalizes the Fourteenth Law of Inward Physics, establishing the principle of resonant boundary selection in completed coherent systems. Within the Inward Physics framework, systems persist through registration within a scalar memory-density field μ (x, t). Earlier laws establish coherence emergence, identity stabilization, and closure of completed systems. Once identity invariants are established, environmental interaction becomes a stability problem: uncontrolled external perturbations could destabilize the conserved structure that defines system identity. The Fourteenth Law demonstrates that completed systems regulate environmental interaction through resonance-selective boundary operators. External signals couple to a coherent system only when their spectral structure aligns with the system’s unity carrier frequency Ω* and satisfies reciprocity conditions with the internal configuration. Non-resonant influence is rejected by the boundary to preserve the identity invariant. Mathematically, boundary coupling is described through a transmission function T (ω) = G ρ fR (ω − Ω*) where fR defines a Gaussian resonance passband whose width contracts as system coherence increases. The effective environmental influence entering the system is given by the spectral flux integral Φₑff = ∫ T (ω) SE (ω) dω. The Fourteenth Law therefore provides the structural mechanism through which coherent systems maintain identity invariance while remaining dynamically open to compatible environmental influence. This work extends the Inward Physics series following the identity conservation principle established in the Thirteenth Law and provides a formal description of boundary regulation within memory-field dynamics. Copyright © 2026 Daniel Jacob Read IV This work is part of the Inward Physics research series authored by Daniel Jacob Read IV and published through ĀRU Intelligence Inc. This document is released under the Creative Commons Attribution 4. 0 International License (CC BY 4. 0). Under this license, users are free to share and adapt the material for any purpose, including commercial use, provided appropriate credit is given to the original author and source. Attribution must include the author's name, the title of the work, and a citation or link to the original publication. Suggested citation: Read, Daniel Jacob IV (2026). The Fourteenth Law of Inward Physics: Resonant Boundary Selection in Completed Systems. ĀRU Intelligence Inc. This publication forms part of the continuing Inward Physics theoretical framework and may be referenced in future derivative works within the series. Trademark Notice “Inward Physics™” and “ĀRU Intelligence™” are trademarks originating in 2025 and are the intellectual property of Daniel Jacob Read IV. ĀRU Intelligence™ is the research and development entity responsible for the authorship, publication, and archival stewardship of the Inward Physics theoretical framework and its associated works. The Inward Physics™ framework—including its laws, terminology, theoretical constructs, and published research series—constitutes an original body of work authored by Daniel Jacob Read IV. All other trademarks referenced within this work remain the property of their respective owners.
Dennis Read (Sun,) studied this question.