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"It can be justifiably argued that Boole had inventented the empty set" [in The Mathematical Analysis of Logic (1847)].
The Empty Set, the Singleton, and the Ordered PairThe Empty Set, the Singleton, and the Ordered Pair, Akihiro Kanamori (2003).
The Empty Set, the Singleton, and the Ordered Pair, Akihiro Kanamori (2003).
