9 lines
191 B
Text
9 lines
191 B
Text
def f (n : Nat) : Nat :=
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if h : n = 0 then
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1
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else
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2 * f (n-1)
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termination_by measure id
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decreasing_by
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simp [measure, id, invImage, InvImage, Nat.lt_wfRel]
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apply Nat.pred_lt h
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