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Hypergraph matching

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In computational complexity theory, 3-Dimensional Matching is one of the famous Karp's 21 NP-complete problems. The problem can be formalized as:

Given , and are disjoint. Does there exist a mathcing such that each element of exists in exactly one set of ?

Note that two-dimensional matching, known as bipartite matching, is solvable in polynomial time. But any dimension higher than 3, is in NP.

Proof of NP

Approximation