Chapter 7, Problem 26E

Explanation of Solution

To prove:

The rule if $\alpha \to \beta$ and $\gamma \to \beta$, then $\alpha \to \gamma$ is not proved by proving a relation that satisfies $\alpha \to \beta$ and $\gamma \to \beta$, but does not satisfy $\alpha \to \gamma$.

Proof:

• Let the given rule for functional dependencies