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lemma proved term proof

coordRay_temporal_spatial

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formal statement (Lean)

 168lemma coordRay_temporal_spatial (x : Fin 4 → ℝ) (s : ℝ) (i : Fin 4) (hi : i ≠ 0) :
 169    (coordRay x 0 s) i = x i := by

proof body

Term-mode proof.

 170  simp [coordRay, basisVec, hi]
 171
 172/-- spatialNormSq is invariant under temporal coordinate ray. -/

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