Talk:Armstrong's axioms

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the sentence "Where XZ means the collection of all attributes in X and Z." is ambiguous, the fact its union should be made explicit -- James Hogan 08:44, 14 June 2007 (UTC)

You are right, James Hogan, it is not understood whether I mean the union or the intersection of two sets. I fixed it. Paolo Serafino 17:57, 15 June 2007 (UTC)