A Structural Criterion for the Applicability of Algebraic Phase Theory

Abstract

Algebraic Phase Theory (APT) exhibits a marked structural selectivity. In certain mathematical and physical settings it gives rise to rigidity phenomena, constrained representation behaviour, and reductions in apparent degrees of freedom, while in many analytic or dynamical contexts the finite-depth APT framework does not naturally apply. This paper studies the structural origin of this asymmetry. We establish a structural criterion for the existence of a nondegenerate finite-depth Algebraic Phase Theory structure. The criterion isolates three conditions: nondegenerate phase duality, compatibility of admissible dynamics with phase interaction, and finite or terminating defect propagation. Within the framework considered here, these conditions are jointly necessary and sufficient. When they are satisfied, the resulting phase structure exhibits strong rigidity properties; when one of the conditions fails, the associated domain falls outside the intended finite-depth APT setting. As consequences, phenomena such as Fourier decomposition, Bethe-type exact solvability, rigidity of stabilizer codes, and uniqueness phenomena associated with certain canonical representations can be interpreted as structural manifestations of these conditions rather than isolated constructions. The results therefore clarify both the scope and the structural limitations of Algebraic Phase Theory within the finite-depth setting considered here.