 Decompositions, approximate structure, transference, and the Hahn-Banach theorem by Timothy Gowers

Author preprint: arxiv.org/abs/0811.3103v1

Sections 2.3–2.6 discuss uniformity norms and phase detection. Section 3, particularly Corollary 3.5, treats norms generated by spanning test families and their duals; section 4 develops dense-model transference.