Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 24 Sep 2017 My Price 3.00

rules for functional dependencies

Prove or disprove the following inference rules for functional dependencies. A proof can be made either by a proof argument or by using inference rules IR1 through IR3. A disproof should be performed by demonstrating a relation instance that satisfies the conditions and functional dependencies in the-left-hand side of the inference rule but does not satisfy the dependencies in the right-hand side.

a. {WâY, X âZ} {WXâY}.

b. {XâY} and Y Z {XâZ}.

c. {X âY, X âW, WY âZ} {X âZ}.

d. {XY âZ, Y âW} {XW âZ}.

e. {X âZ, Y âZ} {X âY}.

f. {X âY, XY âZ} {X âZ}.

g. {X âY, Z âW} {XZ âYW}.

h. {XY âZ, Z âX} {Z âY}.

i. {XâY, Y âZ} {X âYZ}.

j. {XY âZ, Z âW} {X âW}.

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Maurice Tutor
(5)
Status NEW Posted 24 Sep 2017 11:09 AM My Price 3.00

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