/**
* True iff simplices are neighbors.
* Two simplices are neighbors if they are the same dimension and they share
* a facet.
* @param simplex the other Simplex
* @return true iff this Simplex is a neighbor of simplex
*/
public bool isNeighbor(Simplex simplex)
{
HashSet h = new HashSet(this);
h.removeAll(simplex);
return (this.size() == simplex.size()) && (h.size() == 1);
}