Define the Armstrong rules
Define the Armstrong rules.
Expert
The well-identified inference rules for FDs
• Reflexive rule:
X Y, if Y is subset or equal to X.
• Augmentation rule:
XZ YZ, if X Y.
• Transitive rule:
When {X Y, Y Z} then X Z.
• Decomposition rule:
When X YZ then X Y.
• Union or Additive rule:
When {X Y, X Z} then X YZ.
• Pseudo Transitive rule:
When {X Y, WY Z} then WX Z.
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