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structure definition def or abbrev

TimeArrow

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formal statement (Lean)

 167structure TimeArrow where
 168  /-- Verified propositions grow monotonically. -/
 169  past_only_grows : ∀ s₁ s₂ : ProofState,
 170    -- If s₂ is "after" s₁, then s₁.verified ⊆ s₂.verified
 171    s₁.verified ⊆ s₂.verified
 172  /-- Unverified propositions shrink (or new ones appear). -/
 173  future_evolves : True
 174
 175/-- The present is the boundary between past and future. -/

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