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14
15
16 include "coq.ma".
17 alias num (instance 0) = "natural number".
18 alias symbol "eq" (instance 0) = "Coq's leibnitz's equality".
19 alias id "not" = "cic:/Coq/Init/Logic/not.con".
20
21 theorem stupid : \forall a:Prop. a \to not a \to 0 = 1.
22 intros.
23 absurd a.
24 assumption.
25 assumption.
26 qed.