/// <summary>
/// Adds the specified position to the relation. Returns true if it was added, false if it was already present.
/// </summary>
public bool Set(P1 p1)
{
return(Set(Position1.Create(p1)));
}
/// <summary>
/// Returns whether the relation contains the specified position.
/// </summary>
public bool Contains(P1 p1)
{
return(Contains(Position1.Create(p1)));
}