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def definition def or abbrev

surfaceArea

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formal statement (Lean)

 172noncomputable def surfaceArea {V : Type*} [Fintype V] [DecidableEq V]
 173    (adj : V → V → Prop) [DecidableRel adj]
 174    (S : Finset V) : ℕ :=

proof body

Definition body.

 175  (S.filter (fun v => ∃ w ∈ Sᶜ, adj v w)).card
 176
 177/-- Volume of a region: number of vertices. -/

depends on (9)

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