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lemma proved term proof

modal_distance_symm

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formal statement (Lean)

  68lemma modal_distance_symm (c1 c2 : Config) :
  69    modal_distance c1 c2 = modal_distance c2 c1 := by

proof body

Term-mode proof.

  70  unfold modal_distance
  71  exact J_transition_symm c1.pos c2.pos
  72
  73/-! ## Possibility Space Topology -/
  74
  75/-- **POSSIBILITY BALL**: The set of configs within modal distance r of c.
  76
  77    B_r(c) = {y : modal_distance(c, y) ≤ r} -/

depends on (11)

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