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def definition def or abbrev

coordRay

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formal statement (Lean)

  20def coordRay (x : Fin 4 → ℝ) (μ : Fin 4) (t : ℝ) : Fin 4 → ℝ :=

proof body

Definition body.

  21  fun ν => x ν + t * basisVec μ ν
  22

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