public Hypergraph <T> Tr()
{
var H = new Hypergraph <T>(new List <List <T> >()
{
new List <T>()
});
foreach (var e in E)
{
H = H.Product(EdgeHypergraph(e)).Min();
}
return(H);
}
public Hypergraph <T> Product(Hypergraph <T> other)
{
return(new Hypergraph <T>(E.SelectMany(e_i => other.E.Select(e_j => ListUtility.Union(e_i, e_j)).ToList()).ToList()));
}
public Hypergraph <T> Union(Hypergraph <T> other)
{
return(new Hypergraph <T>(E.Union(other.E).ToList()));
}