/// <summary>
/// A method to calculate the absolute value of the given vector.
/// </summary>
/// <param name="v">A vector.</param>
/// <returns>The absolute value of v: (|a| |b|)</returns>
public IVector2D <T> Abs(IVector2D <T> v)
{
return(new Vector2D <T>(Math.Abs(v.X),
Math.Abs(v.Y)));
}