Challenge: denote a set that contains and is a set that contains the null set.
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Challenge: denote a set that contains and is a set that contains the null set.
Hint: I'm looking for the symbolic representation of a set with a two-fold containment of the null set; containing it not only as an element, but as an element of another element...simultaneously.
Something like {∅ , {∅}}?
Is this setian as in temple of set?
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