static int MinEdgeDegree(Choosability.Graph g)
{
var min = int.MaxValue;
for (int v = 0; v < g.N; v++)
{
for (int w = v + 1; w < g.N; w++)
{
if (g[v, w])
{
var cc = ListUtility.Union(g.Neighbors[v], g.Neighbors[w]).Count;
min = Math.Min(min, cc);
}
}
}
return(min);
}
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()));
}