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Commit 71e54c62 authored by François Clément's avatar François Clément
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Try this one?

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Lebesgue/Subset.v
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......@@ -140,6 +140,11 @@ Variable f : U1 -> U2. (* Function. *)
Variable A1 : U1 -> Prop. (* Subset. *)
Variable A2 : U2 -> Prop. (* Subset. *)
(* TODO: try with the following inductive type.
Inductive image_alt : U2 -> Prop :=
| Im : forall x1, A1 x1 -> image_alt (f x1).
*)
Definition image : U2 -> Prop :=
fun x2 => exists x1, A1 x1 /\ x2 = f x1.
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