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**Deveno** the null set has lots of "bad" properties. for example, every element of the null set is in point of fact, a russell set. mappings from the null set are very poorly behaved, their image sets are also russell sets. in fact, the null set is a russell set itself, and being self-contradictory, cannot exist. by the same token, it also is NOT a russell set, and therefore its existence is perfectly legitimate. the null set is the ultimate law-abiding revolutionary. personally, i feel the null set should be locked up in the closet, and only be taken out for special occasions.