Answer
A -> (B, C) is just shorthand for A -> B and A -> C
However, (D, E) -> F means that the composite, as a whole, identifies F.
For example:
EmployeeNumber -> (FirstName, LastName)
This means that
EmployeeNumber -> FirstName
and that
EmployeeNumber -> LastName.
But:
(FirstName, LastName) -> HireDate
does not mean that FirstName -> HireDate (There could be lots of employees named “Bob”.)
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