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Lean 4 Proof

theorem friction_from_vri
    (T χ σ_sq : ℝ) (hχ : 0 < χ) (hvri : σ_sq = T * χ) :
    σ_sq / χ = T := by
  rw [hvri, mul_div_cancel_right₀ T (ne_of_gt hχ)]

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Module Section

## Corollary 3b.2: Mode-Specific Friction Measurement