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The MACLOG layout generator set is built on an object-oriented framework. Most frameworks are built around the hierarchy of module types. We found the <italic>service hierarchy</italic>—the types of information provided to the user by the generator—made the framework and generators easier to design and modify. This paper describes the MACLOG… (More)
Massively parallel programming languages, like StarLogo, provide a rich environment for introducing differential equations to students with an unsophisticated mathematical background. In this paper we describe the basic software for simulating and monitoring various population dynamics. Simple differential equations that describe the observed dynamics are… (More)
We define an orientable one-circuit double cover of a graph as a walk that starts and ends at the same vertex and traverses each edge of the graph exactly twice, once in each direction, but never in immediate succession. We characterize the graphs that have an orientable one-cycle double cover.