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Can SUU->V or any functional dependency that contains two or more times each attribute be simplified to the same dependency with one attribute? So SUU->V becomes SU->V or STTT->Q becomes ST->Q ?

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Yes, each side of a Functional Dependency is a set of attributes, not a multiset, so SUU -> V can be simplified to SU -> V.

If you think about the definition of Functional Dependency you will understand why this is true.

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