8 lines
155 B
Text
8 lines
155 B
Text
theorem ex (n : Nat) (h : n = 0) : 0 + n = 0 := by
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let m := n + 1
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let v := m + 1
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have : v = n + 2 := rfl
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trace_state
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subst h
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trace_state
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rfl
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