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def definition def or abbrev

isPerfect

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formal statement (Lean)

 609def isPerfect (n : ℕ) : Prop := sigma 1 n = 2 * n

proof body

Definition body.

 610
 611instance : DecidablePred isPerfect := fun n => inferInstanceAs (Decidable (sigma 1 n = 2 * n))
 612
 613/-- 6 is perfect. -/

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