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Number of Elements in a Cartesian Product

Consider a re...

Question

$C o n s i d e r a r e l a t i o n R (A, B, C, D, E) w i t h f u n c t i o n a l d e p e n d e n c i e s : N u m b e r o f c a n d i d a t e s k e y i n a b o v e r e l a t i o n R i s______. F = (A E \to C, C D \to E, C \to A, C \to D, D \to E]$

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Solution

$R (A, B, C, D, E) C l o s u r e o f (A B ) = (A, B, C, D, E} A E i s a c a n d i d a t e k e y, C l o s u r e o f (C ) = (C, A, D, E, B} C i s a c a n d i d a t e k e y . C l o s u r e o f (A D *) = (A, D, E, C, E} A D i s a c a n d i d a t e k e y . T o t a l 3 c a n d i d a t e k e y f o r r e l a t i o n R .$

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