Commit e823cff6 authored by Robbert Krebbers's avatar Robbert Krebbers

Comment about `Set_`.

parent 6f5a8ecb
......@@ -1114,7 +1114,10 @@ Arguments insertE _ _ _ _ _ _ !_ _ !_ / : simpl nomatch, assert.
(** The classes [SemiSet A C] and [Set_ A C] axiomatize sset of type [C] with
elements of type [A]. The first class, [SemiSet] does not include intersection
and difference. It is useful for the case of lists, where decidable equality
is needed to implement intersection and difference, but not union. *)
is needed to implement intersection and difference, but not union.
Note that we cannot use the name [Set] since that is a reserved keyword. Hence
we use [Set_]. *)
Class SemiSet A C `{ElemOf A C,
Empty C, Singleton A C, Union C} : Prop := {
not_elem_of_empty (x : A) : x ;
......
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