10 lines
196 B
Text
10 lines
196 B
Text
def f (x y : Nat) : Nat :=
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x + 2*y
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-- "+" with priority higher than the builtin "+" notation
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infix:65 (priority := high) "+" => f
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#check 1 + 2
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theorem ex (x y : Nat) : x + y = f x y :=
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rfl
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