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Paper IPM / M / 14971  


Abstract:  
Suppose that V={1â, â…â, ân} is a nonempty set of n elementsâ, âA={A_{1}â, â…â, âA_{m}} a nonempty family of m nonempty subsets of Vâ, âand 2 ≤ d ≤ n a positive integerâ. âIn this paperâ, âwe investigate the question arises whether there exists a duniform hypergraph H with V(H)=V where A is the set whose elements are the minimal vertex cover sets of Hâ.
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