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16 lines
225 B
Plaintext
16 lines
225 B
Plaintext
module Nat;
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type Bool :=
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| true : Bool
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| false : Bool;
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type Nat :=
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| zero : Nat
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| suc : Nat → Nat;
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is-zero : Nat → Bool;
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is-zero n :=
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case n
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| zero := true
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| suc _ := false;
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end;
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