POLYANALYTIC BESOV SPACES AND APPROXIMATION BY DILATATIONS

Using partial derivatives partial derivative f /partial derivative z and partial derivative f /partial derivative(z) over bar, we introduce Besov spaces of polyanalytic functions in the open unit disk, as well as in the upper half-plane. We then prove that the dilatations of functions in certain weighted polyanalytic Besov spaces converge to the same functions in norm. When restricted to the open unit disk, we prove that each polyanalytic function of degree q can be approximated in norm by polyanalytic polynomials of degree at most q.