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def definition def or abbrev

spaceShift

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formal statement (Lean)

  71def spaceShift (dx : ℝ) : RealAction → RealAction :=

proof body

Definition body.

  72  fun γ t => γ t + dx
  73
  74/-- A J-action functional on real-valued trajectories is
  75    space-translation invariant if shifting the trajectory by a constant
  76    leaves the action unchanged. -/

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