A Unified Structural Model of Constraint, Stability, and Cross Domain Collapse Behaviour

This paper develops a unified structural model demonstrating how boundary conditions determine system behaviour across physical, conceptual, and hypothetical domains. Using the A–B–C boundary framework, the analysis shows that structured environments eliminate random possibilities and that stability is a prerequisite for formation, identity, and coherent behaviour. The model is applied to three conceptual areas: the collapse of identical parallel universes, symmetry‑activated dimensional overlap, and the dissolution of under‑defined conceptual binaries. In each case, the same constraint principle emerges — identical boundary conditions produce identical outcomes, instability prevents divergence, and systems resolve into single coherent states. The paper provides a minimal, cross‑domain framework for understanding constraint, stability, and collapse behaviour in cosmology, hypothetical dimensional interaction, and structural reasoning.