Non-Selective Phase Model (NSPM): A Structural Model of Phase Without Selection

This document specifies the Non-Selective Phase Model (NSPM), a minimal structural model of phase behavior in which no selective mechanism operates on phase differences. The model defines a regime in which all phase states remain structurally equivalent—no phase is privileged, stabilized, or eliminated by selection. When phase differences are composed without selection, the system does not converge to a dominant phase but instead maintains a closed phase structure. No attractor or terminal phase emerges. This model is the complementary counterpart to the Inversion-Closure Model (ICM). Both models are structurally equal and mutually dependent: neither can form a complete system in isolation. No symbolic, semantic, physical, or metaphysical interpretation is assumed.