4 lines
215 B
Text
4 lines
215 B
Text
@[elab_as_elim]
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def strongSubRecursion {P : Nat → Nat → Sort _} (H : ∀ a b, (∀ x y, x < a → y < b → P x y) → P a b) :
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∀ n m : Nat, P n m
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| n, m => H n m fun x y _ _ => strongSubRecursion H x y
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