internal override List <TVertex> GetVVertexList()
        {
            List <TVertex> list = new List <TVertex>(VSize);

            list.AddRange(VVertexList.Take(VSize));
            return(list);
        }
 internal override bool IsVVertex(TVertex vertex)
 {
     return(VSize != 0 && AreInTheSamePartition(VVertexList.First(), vertex));
 }