1,721,035 research outputs found

    Pre-Socratic Discrete Kinematics

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    We present a neglected heterodox version of Zeno’s paradox of the Stadium, underlining some problems that a discrete kinematics would have to account for. Building on our reconstruction of the Stadium ar- gument we provide new arguments to show that a discrete kinematics cannot uphold three independently plausible assumptions about motion, that we label No Switching, Granular Continuity and Different Velocities, and hence it should drop at least one

    Parthood and Composition in Quantum Mechanics

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    The paper deals with parts and wholes in quantum theory. It addresses a much neglected question, namely of what mereological theory are quantum systems a model of. It argues that they are at least a model of the so called Closed Extensional Mereology. It then goes on to address the question of whether quantum theory favors a particular answer to what is known as the special composition question, i.e. what are the sufficient and necessary conditions a set of entities has to meet in order to have a mereological sum. It is suggested that quantum mechanics by itself falls short to yield a definitive answer to that question and different possible suggestions are explored. One of them is that quantum theory, together with some mild assumptions, such as the one that maintains that there are no uninstantiatedproperties, delivers at least a sufficient condition for having a mereological sum. This condition turns out to be that the quantum system is in an entangled state

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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