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def definition def or abbrev

IsSymmetryOf

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formal statement (Lean)

  46def IsSymmetryOf {X : Type*} (T : X → X) (J : X → ℝ) : Prop :=

proof body

Definition body.

  47  ∀ x : X, J (T x) = J x
  48
  49/-- **THEOREM**: The identity is always a symmetry. -/

used by (13)

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depends on (8)

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