`BookProof.ChapterE4.cross_diag_zero` (θ : ℕ → ℝ) (s d i : ℕ) : basisVec s i * wave θ (s + 1) d i = 0

Proved

BookProof.ChapterE4.cross_diag_zero

by leonardopedro · Oct 7, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterE4.

BookProof.ChapterE4.cross_diag_zero (θ : ℕ → ℝ) (s d i : ℕ) : basisVec s i * wave θ (s + 1) d i = 0

Formalization note: Lean 4 identifier BookProof.ChapterE4.cross_diag_zero.

Preamble

-- Generated from ChapterE4.lean — theorem BookProof.ChapterE4.cross_diag_zero
import Mathlib
import Definitions.Def_ChapterE4
open BookProof.ChapterE4


open scoped BigOperators

Formal statement

theorem BookProof.ChapterE4.cross_diag_zero (θ : ℕ → ℝ) (s d i : ℕ) :
    basisVec s i * wave θ (s + 1) d i = 0 := by sorry

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