IV.D72 — σ-Equivariant Crossing-Point Mediator

A σ-equivariant crossing-point mediator h > 0 on L = S¹∨S¹ is a constant arising from a character χ ∈ L-hat at ω, satisfying σ-equivariance (χ∘σ = χ) and geometric mean consistency h² = h_γ·h_η.