TY - CHAP A1 - De Nicola, Rocco A1 - Hennessy, Matthew SN - 3-540-17660-8 T2 - TAPSOFT '87, Vol.1 PB - Springer ED - Ehrig, Hartmut ED - A. Kowalski, Robert ED - Levi, Giorgio ED - Montanari, Ugo T3 - Lecture Notes in Computer Science TI - CCS without tau's EP - 152 N2 - The main point of this paper is that one can develop an adequate version of CCS which does not use the special combinator tau for internal actions. Instead, the choice operator +, whose semantics is somewhat unclear, is replaced by two new choice operators oplus and [], representing internal and external nondeterminism respectively. The operational semantics of the resulting language is simpler and the definition of testing preorders is significantly cleaner. The essential features of the original calculus are kept; this is shown by defining a translation from CCS to the new language which preserves testing preorders. AV - none Y1 - 1987/// SP - 138 ID - eprints385 UR - http://dx.doi.org/10.1007/3-540-17660-8_53 M1 - 249 ER -