`BookProof.ChapterE4.diag_collapse` (θ : ℕ → ℝ) (s d i : ℕ) : (wave θ s (d + 1) i) ^ 2 = Real.cos (θ s) ^ 2 * (basisVec s i) ^ 2 + Real.sin (θ s) ^ 2 * (wave θ (s + 1) d i) ^ 2

Initializing...

`BookProof.ChapterE4.diag_collapse` (θ : ℕ → ℝ) (s d i : ℕ) : (wave θ s (d + 1) i) ^ 2 = Real.cos (θ s) ^ 2 * (basisVec s i) ^ 2 + Real.sin (θ s) ^ 2 * (wave θ (s + 1) d i) ^ 2 · Prove2Me