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window8Sum
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75def window8Sum (f : ℕ → ℝ) (Z0 : ℕ) : ℝ :=
proof body
Definition body.
76 (Finset.range 8).sum (fun k => f (Z0 + k))
77
78/-! ## Noble Gas Closure Infrastructure
79
80We define a valence proxy and prove that noble gases are exactly the
818-window closure points.
82-/
83
84/-- The canonical noble gas atomic numbers (first 6 periods + Oganesson). -/