@article{oai:ynu.repo.nii.ac.jp:00006699, author = {Kishimoto, Akitaka}, issue = {1&2}, journal = {Yokohama Mathematical Journal = 横濱市立大學紀要. D部門, 数学}, month = {}, note = {application/pdf, We study crossed products of $C^{*}$-dynamical systems $(A, R, ¥alpha)$ when $¥alpha$ is asymptotically abelian. In particular we show that the crossed product is simple if and only if the system has neither ground states nor ceiling states, provided that $A$ is $¥alpha$-simple and unital and $¥alpha$ is faithful. In the appendix we study the case where $¥alpha$ is uniformly continuous, and remark that it gives us proof of some of the well-known results on inner implementability of derivations.}, pages = {151--164}, title = {C^{*}-CROSSED PRODUCTS BY R}, volume = {30}, year = {1982} }