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theorem proved term proof

spatialRadius_pos_iff

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formal statement (Lean)

 153theorem spatialRadius_pos_iff (x : Fin 4 → ℝ) : 0 < spatialRadius x ↔ 0 < spatialNormSq x := by

proof body

Term-mode proof.

 154  unfold spatialRadius
 155  rw [Real.sqrt_pos]
 156

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