1
vote
1answer
62 views

Difference between $A\to B\to C$ and $A\to(B\to C)$

As the title says, what is the difference between $A\to B\to C$ and $A\to(B\to C)$? I have tried to reduce these expressions into $A\to B === (A\text{ OR } \text{NOT} B)$ form but didn't get anywhere. ...
0
votes
2answers
285 views

Functional dependencies A->B and C->B, but not AC->B?

If I have a relation: A B C 1 2 3 4 5 6 7 2 8 Where $A\mapsto B$ and $C \mapsto B$. Doesn't that mean that $AC \mapsto B$? How can you even have this relation? ...