Question

A relation $R$ in a set $A$ is called empty relation, if

• A. no element of $A$ is related to any element of $A$
• B. every element of $A$ is related to every element of $A$
• C. some elements of $A$ are related to some elements of $A$
• D. None of the above

Answer 1

Answer: (A)

A relation $R$ in a set $A$ is called empty relation,
if no element of $A$ is a related to any element of $A$,
i.e., $R=\varphi \subset A\times A$