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  • theorem of expressive equivalence between relational languages (en)
  • théorème exprimant l'équivalence entre l'algèbre relationnelle et le calcul relationnel (fr)
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  • Codd's theorem (en)
  • Teorema de Codd (ca)
  • Théorème de Codd (fr)
  • Teorema di Codd (it)
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