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In comparative concurrency semantics, one usually distinguishes between <italic>linear time</italic> and <italic>branching time</italic> semantic equivalences. Milner's notion of <italic>observatin equivalence</italic> is often mentioned as the standard example of a branching time equivalence. In this paper we investigate whether observation equivalence… (More)
In this paper we discuss term-rewriting systems with ru/e prioriries, which simply is a partial ordering on the rules. The procedural meaning of such an ordering then is, that the application of a rule of lower priority is allowed only if no rule of higher priority is applicable. The semantics of such a system is discussed. It turns out that the class of… (More)
The question " what is Bitcoin " allows for many answers depending on the objectives aimed at when providing such answers. The question addressed in this paper is to determine a top-level classification, or type, for Bitcoin. We will classify Bitcoin as a system of type money-like informational commodity (MLIC).