Hi Mohammed,

You have got my curiosity up. Could you provide your proof for others to see?

Thanks

>hi,
>thank you for reply, and help
>
>i don't need it ,
>
>thanks again.
>
>best regards
>
>m.qasem
>
>
>
>
>>>hi all,
>>>any idea .
>>>
>>>Consider the following set of functional dependancies :
>>>
>>>
>>>
>>>F = { AB ــ> CD , D ـــ> EF , G ــــ> A , Eــــــ>B , C ــــ> G }
>>>
>>>
>>>
>>>a- prove that the following two functional dependencies are entailed by F , using only the definition of a functional dependency :
>>>
>>>
>>>
>>>1 - DG ــــ> AEF
>>>
>>>2 - EG ـــــ> FG
>>>
>>>thanks.
>>
>>What do you mean with "functional dependency"? And what do the combinations, like "AB" or "EF" stand for?