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Set theory is the branch of mathematics that studies unordered collections of objects. Challenges with this tag will involve the manipulation or analysis of sets.

4 votes

The Jaccard Index

Julia, 26 characters, 30 bytes Correction from Ashlin Harris much appreciated. n=length A\B=n(A∩B)/n(A∪B) Doesn't actually require A and B to be Set objects, as if they aren't it converts them anyway …
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