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_=ₛ_
and ⊆ + reverse
for lib-2.0
#2353
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We already have many different formalisations of this notion: while I would welcome a proof that bidirectional subset inclusion implies these, I really don't think we want to be adding yet another relation. |
If we do add this new relation, I think we should name it the same as |
See also the recently added (#2070 / #2071 ) https://github.com/agda/agda-stdlib/blob/master/src/Relation/Binary/Construct/Interior/Symmetric.agda |
I agreed, but I still really don't think we should add it as a first class relation, merely a proof that the construction is equivalent to the current definitions of set equality. |
I suggest to add to standard library the following items.
To Data.List.Relation.Binary.Subset.Setoid:
To Data.List.Relation.Binary.Subset.Setoid.Properties:
This is because the above items are usable.
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