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abbrev definition def or abbrev

ConfigProp

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formal statement (Lean)

 308abbrev ConfigProp := Config → Prop

proof body

Definition body.

 309
 310/-- **MODAL NECESSITY (□)**: A property is necessary iff it holds in ALL possible futures.
 311
 312    □p at c ⟺ ∀ y ∈ P(c), p(y)
 313
 314    In RS, necessity means "forced by cost minimization." -/

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