set, subset, union, intersection, complement。集合/子集/并集/交集/补集。
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• set theory is a part of discrete math which -blackmatter- ♀ (40 bytes) () 08/17/2013 postreply 12:44:55
• set theory is a part of discrete math which -blackmatter- ♀ (40 bytes) () 08/17/2013 postreply 12:44:55