matita/matita/tests/absurd.ma

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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.