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Excerpt from Revue de Math¿tiques Sp¿ales, Vol. 9: Ann¿ 1906-1907 Et 1907-1908
C'est une premi¿ relation entre les quatre sommets du t¿a¿e variable mnpq. On obtient deux autres relations entre ces quatre points en choisissant, au lieu de l'ar¿ ab, deux autres ar¿s du t¿a¿e abcd, de fa¿ que les trois ar¿s choisies ne soient pas dans un m¿ plan. Il ne peut d'ailleurs y avoir plus de trois relations distinctes.
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