13 lines
364 B
Text
13 lines
364 B
Text
import data.vector
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open nat
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namespace vector
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variables {A : Type} {n : nat}
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protected definition destruct2 (v : vector A (succ (succ n))) {P : Π {n : nat}, vector A (succ n) → Type}
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(H : Π {n : nat} (h : A) (t : vector A n), P (h :: t)) : P v :=
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begin
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cases v with (n', h', t'),
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apply (H h' t')
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end
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end vector
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