A. Mercier

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There will be a few themes. One to get us going: expansion versus contraction. About an object, o, and the region, R, of space(time) in which o is exactly located, 1 we may ask: i) must there exist expansions of o: objects in lled superregions 2 of R? ii) must there exist contractions of o: objects in lled subregions of R? Despite the apparent symmetry,(More)
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