Question

in functional dependency armstrong inference rules refers to

Comments

he wanted to know about RAT rules . Question should be reopened .

Answer 1

Armstrong axioms consist of the following three rules:

 1.  Reflexivity: If Y ⊆ X, then X → Y.

  2. Augmentation: If X → Y , then XZ → YZ.

 3. Transitivity: If X → Y and Y → Z, then X → Z0.

other three rules can be derived from this.