90def H_ShadowFringeObservable (Rs dist res : ℝ) : Prop :=
proof body
Definition body.
91 let theta_Rs := Rs / dist 92 let f_fringe := 1 / (8 * tau0) 93 -- The fringe is observable if the spatial wavelength exceeds resolution 94 ∃ lambda_fringe : ℝ, lambda_fringe > 0 ∧ 95 -- Physical constraint: wavelength is related to fringe frequency and light travel time 96 lambda_fringe = c_SI / f_fringe * theta_Rs 97 98/-- **THEOREM (RIGOROUS)**: Existence of a spatial wavelength. 99 100 This proves that a spatial wavelength CAN be defined for any finite tau0. 101 Whether it exceeds the resolution is an empirical question. -/
depends on (20)
Lean names referenced from this declaration's body.