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def definition def or abbrev

modally_equivalent

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formal statement (Lean)

 142def modally_equivalent (c1 c2 : Config) : Prop :=

proof body

Definition body.

 143  c1.value = c2.value ∧ (c1.time : ℤ) - (c2.time : ℤ) < 1 ∧ (c2.time : ℤ) - (c1.time : ℤ) < 1
 144
 145/-- Modal equivalence is reflexive. -/

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