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Small improvements to IntroToProofScripting

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This commit is contained in:
Adam Chlipala 2018-02-28 09:01:07 -05:00
parent 256995f1dd
commit 76970fb98e
2 changed files with 8 additions and 9 deletions
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12
IntroToProofScripting.v
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@ -373,7 +373,7 @@ Ltac completer :=
| [ |- _ /\ _ ] => constructor
| [ |- forall x, _ ] => intro
| [ |- _ -> _ ] => intro
(* Interestingly, these last two rules are redundant.
(* Interestingly, the last rule is redundant with the second-last.
* See CPDT for details.... *)
end.
@ -859,21 +859,23 @@ Section t7'.
Qed.
End t7'.
(* One more example of working with existentials: *)
Theorem t8 : exists p : nat * nat, fst p = 3.
Proof.
econstructor.
instantiate (1 := (3, 2)).
(* ^-- We use [instantiate] to plug in a value for one of the "question-mark
* variables" in the conclusion. The [1 :=] part says "first such variable
* mentioned in the conclusion, counting from right to left." *)
equality.
Qed.
(* A way that plays better with automation: *)
Ltac equate x y :=
let dummy := constr:(eq_refl x : x = y) in idtac.
Theorem t9 : exists p : nat * nat, fst p = 3.
Proof.
econstructor; match goal with
| [ |- fst ?x = 3 ] => equate x (3, 2)
| [ |- fst ?x = 3 ] => unify x (3, 2)
end; equality.
Qed.

5
IntroToProofScripting_template.v
View file

@ -545,12 +545,9 @@ Qed.
(* A way that plays better with automation: *)
Ltac equate x y :=
let dummy := constr:(eq_refl x : x = y) in idtac.
Theorem t9 : exists p : nat * nat, fst p = 3.
Proof.
econstructor; match goal with
| [ |- fst ?x = 3 ] => equate x (3, 2)
| [ |- fst ?x = 3 ] => unify x (3, 2)
end; equality.
Qed.