We will characterize the compactness of linear combinations of composition operators on the Banach algebra of bounded analytic functions on the open unit disk. Furthermore we will estimate the norms and the essential norms of them. © 2007 Elsevier Inc. All rights reserved.
Izuchi, K. J., & Ohno, S. (2008). Linear combinations of composition operators on H∞. Journal of Mathematical Analysis and Applications, 338(2), 820–839. https://doi.org/10.1016/j.jmaa.2007.05.061