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Primitive

Phase Differential (Δϕ)

Phase is assigned to comparisons and composes: Φ(b∘a)=Φ(b)Φ(a)\Phi(b\circ a) = \Phi(b)\Phi(a). A difference of vertex phases θy−θx\theta_y - \theta_x is the restricted case whose loop phases all equal 1.

Mathematical object

A phase functor Φ:G→BU(1)\Phi: G \to BU(1) on a groupoid of comparisons.

Assumptions

A0 to A2: distinctions, circle phase and coherent comparison.

Scope

Structural; no distance, clock or embedding is included.

Current foundations

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