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let vector l = Math.Notation.vector l

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type vector (x, y) =


    member v.x = x


    member v.y = y


        static member add (a : vector, b : vector) =


            new vector (a.x + b.x, a.y + b.y)

let a = new vector (1.0, 2.0)


let b = new vector (2.0, 1.0)


let c = vector.add (a, b) // error FS0039: The field, constructor or member 'add' is not defined.