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1976
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Jean-Paul Doignon et al., « Automorphismes et semi-espaces de réseaux cristallographiques », Bulletins de l'Académie Royale de Belgique, ID : 10.3406/barb.1976.58137
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Any automorphism of a cristallographical lattice is induced by an affinity. We give an elementary proof for this, and also study semi-spaces for the induced convexity and the segment convexity. E.g., we exhibit finite semispaces in lattices.