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1 parent 7d840b4 commit 840b140Copy full SHA for 840b140
theories/cat.v
@@ -1190,6 +1190,7 @@ Qed.
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End natural2prepullback.
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End Pullback_Natural.
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+
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Notation square u v f g :=
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(isPrePullback _ _ _ (Cospan f g) (Span u v)).
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Notation pbsquare u v f g :=
@@ -1198,6 +1199,9 @@ Notation pb s := (prepullback_isTerminal _ _ _ _ s).
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Notation "P <=> Q" := ((P -> Q) * (Q -> P))%type (at level 70).
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+(**********************************************************************)
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Section th_of_pb.
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Variables (Q : cat) (A B C D E F : Q).
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Variables (f : A ~> D) (g : B ~> D) (h : C ~> A).
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