Irrational Rotation Algebra as a Crossed Product

In this paper will consider the crossed product C(T)×? ?, where T is the unit circle, ?(n) =?n is a rotation through the angle -2?n? for n ? ?, and ? is a fixed irrational sent this crossed product as a C*-subalgebra of B (L^2(T)). Also, by a different method form the proof of Davidson, we show that this crossed product is isomorphic to the irrational.