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Le rythme à la croisée des mouvements de l’homme et des mouvements de la nature

Abstract : Bernard GUY is civil mining engineer (Mines Paris), Doctor of Science (Pierre and Marie Curie University, Paris), emeritus research director at the Ecole des Mines de Saint-Etienne, Institut Mines Télécom. Former director of the geology department of the Ecole des Mines, he conducts research and teaches in earth sciences, physics and philosophy of science. He has organized and co-organized international conferences in thermodynamics (Joint European Thermodynamics Conference), and philosophy of science (Workshops on contradiction). In the present paper, he puts the notion of rhythm to the test of his understanding of the fundamental link between space and time, captured in the primacy of movement. A composition of the usual substantial rationality with a relational rationality is necessary for this. A certain number of points are set out in a preliminary way: – rhythm articulates space and time (or spatiality and temporality) : the trace in space (which is memory) makes it possible to express the (possibly periodic) structure of the rhythm by comparison with the development of the temporal process in progress; – one merely appreciates the rhythms in relation to each other; – to stabilize these comparisons one needs to choose a standard rhythm in a conventional way; – if one wants to see this need for convention, the question of the periodicity of the rhythm at the limit does not arise; – relational thinking functions in two stages and one can oppose the rhythm in its first apprehension by perception on the one hand, with its analysis and modelling in a discourse on the other. We thus find ourselves at a crossroads: – the rhythms of nature influence the rhythms of man (and the time and space of nature provide measures of general validity); and, conversely, if we may say so, – understanding the rhythms of nature does not avoid human conventions, or choices. In the natural and human sciences respectively, rhythm appears first – as a regular or periodic phenomenon, in time, space, or both, in relation to the propagation of a wave; and – as the perceived/transcribed structure, through the succession in space and/or time, of more or less remarkable events based on human activity s.l. Bernard Guy now insists on the interplay of relative movements as a support for rhythms (and marking the limits between spatiality and associated temporalities), and the hypothesis of assumed/decided equal increments dividing the movement; these points allow the definition of rhythm to converge on both sides (natural sciences/human sciences). A few examples are given, borrowed from both the human and social sciences and the natural sciences (earth sciences in particular).
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Bernard Guy. Le rythme à la croisée des mouvements de l’homme et des mouvements de la nature. PLASTIR, [Longpont-sur-Orge]: PSA research Group, 2020. ⟨emse-02944687⟩

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