public abstract class Ellipsoid<T> : Ellipsoid
where T : new(), Ellipsoid

Public MustInherit Class Ellipsoid(Of T As {New, Ellipsoid})
	Inherits Ellipsoid

generic<typename T>
where T : gcnew(), Ellipsoid
public ref class Ellipsoid abstract : public Ellipsoid

[<AbstractClassAttribute>]
type Ellipsoid<'T when 'T : new() and Ellipsoid> =  
    class
        inherit Ellipsoid
    end