For every set there is a set whose elements are exactly the sets all of whose elements belong to it.
For every set there is a set such that, for every set , if and only if every set with satisfies .
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For every set there is a set whose elements are exactly the sets all of whose elements belong to it.
For every set there is a set such that, for every set , if and only if every set with satisfies .
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No relations recorded yet.