RT Book, Section T1 On the unification of process semantics: observational semantics A1 Frutos Escrig, David de A1 Gregorio Rodríguez, Carlos A1 Palomino, Miguel A2 Nielsen, Mogens A2 Kucera, Antonin A2 Miltersen, Peter Bro A2 Palamidessi, Castuscia A2 Tuma, Petr A2 Valencia, Frank AB The complexity of parallel systems has produced a large collection of semantics for processes. Van Glabbeek’s linear time-branching time spectrum provides a classification of most of these semantics; however, no suitable unified definitions were available. We have discovered how to unify them, both in an observational framework and in an equational framework. In this first part of our study we present the observational semantics, that stresses the differences between the simulation (branching) semantics and the extentional (linear) semantics. As a result we rediscover the classification in van Glabbeek’s spectrum and shed light on it, obtaining a framework where we can consider all the semantics in the spectrum at the same time. Also, we have discovered some “lost links” that correspond to semantics, possibly not too interesting (at the moment), that provide a clearer picture of the spectrum. PB Springer SN 978-3-540-95890-1 YR 2009 FD 2009 LK https://hdl.handle.net/20.500.14352/53214 UL https://hdl.handle.net/20.500.14352/53214 LA eng DS Docta Complutense RD 20 may 2024