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The Roman sewers were mostly drainage canals. They drained flood prone valleys between the hills and near the river Tiber, which often flooded. Despite this, some areas of the city remained vulnerable to the floods of the Tiber. The sewers were also built to reclaim swampy areas. Very few houses were connected to the sewers. They were hardly used for sanitation.
An empty set becomes an empty set by virtue of its definition which states that it is a set that contains no elements. In other words, it contains nothing, it is empty!
half empty
The only subset of an empty set is the empty set itself.
Yes,an empty set is the subset of every set. The subset of an empty set is only an empty set itself.