“…In each case one of the the main goals is to discover the connection between the properties of the inducing function ϕ and the operator theoretic properties of C ϕ , for example, being bounded, compact, invertible, normal, subnormal, isometric, closed range, Fredholm, and many others. Extensive references for many of the known results on the subject can be found in [1,2,6,10,12,13,14]. In [4,5] we characterized bounded, compact and fredholm composition operators on Harmonic Bloch function spaces.…”