Discussion
In the context of functional dependency, Armstrong inference rules refer to :
Answer: C
Armstrong's inference rules are reflexivity, augmentation and transitivity.
- Reflexivity: if Y is a subset of X, then X → Y.
- Augmentation: if X → Y, then XZ → YZ.
- Transitivity: if X → Y and Y → Z, then X → Z.
These three axioms are sound and complete for deriving every functional dependency in the closure. Decomposition (and union, pseudotransitivity) are additional rules derived from them, so options naming decomposition list a derived rule instead of augmentation.
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