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def definition def or abbrev

velocity_sq

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formal statement (Lean)

 264def velocity_sq (v : Displacement) (_ : v ⟨0, by omega⟩ ≠ 0) : ℝ :=

proof body

Definition body.

 265  spatial_norm_sq v / temporal_sq v
 266
 267/-- **Proper time from velocity**: dτ² = (Δt)²(1 − v²). -/

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