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>> No.8302720 [View]
File: 13 KB, 660x353, sets.png [View same] [iqdb] [saucenao] [google]
8302720

It seems a bit strange to me that {1} wouldn't be considered an element of {{1,2,3},4,5}. Is this part of the definition of sets, or is it a logical result of the definition?

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