in the tutorial, chapter 2., "Relational Data Model Formalities"
(sql490.htm), there is
"set of all k-tuples v1, v2, ... vk, such that v1 [isin] D1, v1 [isin] D1"
i assume it should be
"set of all k-tuples v1, v2, ... vk, such that v1 [isin] D1, v2 [isin] D2"
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