2014-12-01 05:16:01 +00:00
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prelude definition bool : Type.{1} := Type.{0}
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2014-09-17 21:39:05 +00:00
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definition and (p q : bool) : bool := ∀ c : bool, (p → q → c) → c
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2014-07-01 23:55:41 +00:00
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infixl `∧`:25 := and
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2014-06-16 21:09:12 +00:00
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2014-10-02 23:20:52 +00:00
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constant a : bool
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2014-06-16 21:09:12 +00:00
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-- Error
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2015-03-13 21:47:21 +00:00
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theorem and_intro1 (p q : bool) (H1 : p) (H2 : q) : a
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2014-06-16 21:09:12 +00:00
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:= fun (c : bool) (H : p -> q -> c), H H1 H2
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-- Error
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2015-03-13 21:47:21 +00:00
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theorem and_intro2 (p q : bool) (H1 : p) (H2 : q) : p ∧ p
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2014-06-16 21:09:12 +00:00
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:= fun (c : bool) (H : p -> q -> c), H H1 H2
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-- Error
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2015-03-13 21:47:21 +00:00
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theorem and_intro3 (p q : bool) (H1 : p) (H2 : q) : q ∧ p
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2014-06-16 21:09:12 +00:00
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:= fun (c : bool) (H : p -> q -> c), H H1 H2
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-- Correct
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2015-03-13 21:47:21 +00:00
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theorem and_intro4 (p q : bool) (H1 : p) (H2 : q) : p ∧ q
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2014-06-16 21:09:12 +00:00
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:= fun (c : bool) (H : p -> q -> c), H H1 H2
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2015-03-13 21:47:21 +00:00
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check and_intro4
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