@article{oai:niigata-u.repo.nii.ac.jp:00002082, author = {Hosokawa, Takuya and Izuchi, Keiji}, issue = {3}, journal = {Journal of the Mathematical Society of Japan}, month = {}, note = {We study essential norms of differences of composition operators on the Banach algebra H^∞ of bounded analytic functions on the unit disk.}, pages = {669--690}, title = {Essential norms of differences of composition operators on H^∞}, volume = {57}, year = {2005} }