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authorGravatar notin <notin@85f007b7-540e-0410-9357-904b9bb8a0f7>2006-10-17 12:53:34 +0000
committerGravatar notin <notin@85f007b7-540e-0410-9357-904b9bb8a0f7>2006-10-17 12:53:34 +0000
commit28dc7a05cc1d3e03ed1435b3db4340db954a59e2 (patch)
tree63cdf18cd47260eb90550f62f7b22e2e2e208f6c /theories/Logic/ClassicalEpsilon.v
parent744e7f6a319f4d459a3cc2309f575d43041d75aa (diff)
Mise en forme des theories
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@9245 85f007b7-540e-0410-9357-904b9bb8a0f7
Diffstat (limited to 'theories/Logic/ClassicalEpsilon.v')
-rw-r--r--theories/Logic/ClassicalEpsilon.v34
1 files changed, 17 insertions, 17 deletions
diff --git a/theories/Logic/ClassicalEpsilon.v b/theories/Logic/ClassicalEpsilon.v
index 6c8631a9b..102edba5d 100644
--- a/theories/Logic/ClassicalEpsilon.v
+++ b/theories/Logic/ClassicalEpsilon.v
@@ -8,7 +8,7 @@
(*i $Id$ i*)
-(** *** This file provides classical logic and indefinite description
+(** This file provides classical logic and indefinite description
(Hilbert's epsilon operator) *)
(** Classical epsilon's operator (i.e. indefinite description) implies
@@ -23,28 +23,28 @@ Set Implicit Arguments.
Axiom constructive_indefinite_description :
forall (A : Type) (P : A->Prop),
- (exists x, P x) -> { x : A | P x }.
+ (exists x, P x) -> { x : A | P x }.
Lemma constructive_definite_description :
forall (A : Type) (P : A->Prop),
- (exists! x, P x) -> { x : A | P x }.
+ (exists! x, P x) -> { x : A | P x }.
Proof.
-intros; apply constructive_indefinite_description; firstorder.
+ intros; apply constructive_indefinite_description; firstorder.
Qed.
Theorem excluded_middle_informative : forall P:Prop, {P} + {~ P}.
Proof.
-apply
- (constructive_definite_descr_excluded_middle
- constructive_definite_description classic).
+ apply
+ (constructive_definite_descr_excluded_middle
+ constructive_definite_description classic).
Qed.
Theorem classical_indefinite_description :
forall (A : Type) (P : A->Prop), inhabited A ->
- { x : A | (exists x, P x) -> P x }.
+ { x : A | (exists x, P x) -> P x }.
Proof.
-intros A P i.
-destruct (excluded_middle_informative (exists x, P x)) as [Hex|HnonP].
+ intros A P i.
+ destruct (excluded_middle_informative (exists x, P x)) as [Hex|HnonP].
apply constructive_indefinite_description
with (P:= fun x => (exists x, P x) -> P x).
destruct Hex as (x,Hx).
@@ -90,13 +90,13 @@ Opaque epsilon.
(** *** Weaker lemmas (compatibility lemmas) *)
Theorem choice :
- forall (A B : Type) (R : A->B->Prop),
- (forall x : A, exists y : B, R x y) ->
- (exists f : A->B, forall x : A, R x (f x)).
+ forall (A B : Type) (R : A->B->Prop),
+ (forall x : A, exists y : B, R x y) ->
+ (exists f : A->B, forall x : A, R x (f x)).
Proof.
-intros A B R H.
-exists (fun x => proj1_sig (constructive_indefinite_description _ (H x))).
-intro x.
-apply (proj2_sig (constructive_indefinite_description _ (H x))).
+ intros A B R H.
+ exists (fun x => proj1_sig (constructive_indefinite_description _ (H x))).
+ intro x.
+ apply (proj2_sig (constructive_indefinite_description _ (H x))).
Qed.