This paper derives Schrödinger evolution as a structural consequence of coherent persistence rather than as a postulate of quantum mechanics. Starting from minimal requirements for viable propagation—linearity, norm preservation, and continuity—we show that admissible evolution must be unitary and generated by a self-adjoint operator. The resulting Schrödinger equation describes reversible propagation within the space of viable states, while irreversible selection arises separately from the return operation. This separation clarifies the relation between unitary dynamics and measurement without introducing collapse mechanisms or stochastic dynamics. Schrödinger evolution thus emerges as the unique form of continuous, coherence-preserving propagation compatible with structural closure and return, completing the dynamical layer of the Structural Coherence framework.
Preliminary sketch extending the Projective Dynamic Logo (PDL) framework toward an effective Schrödinger-type dynamics. The electron is modeled as a minimal
(4,6) signed graph and the proton as a hierarchical structure with valence cores, active surface, and relational sea. A discrete position toy model and a flux ansatz are used to motivate Laplacian-like kinetic and Coulomb-like potential terms, and to show that the structurally defined fine-structure constant
αPDL is compatible with hydrogenic phenomenology. The work is programmatic and emphasises modelling assumptions and consistency checks rather than a full derivation of quantum dynamics.