In Questions Determine Whether the Binary Relation Is:
(1) Reflexive

Short Answer

In questions determine whether the binary relation is:
(1) reflexive, (2) symmetric, (3) antisymmetric, (4) transitive.
- $$\text { The relation } R \text { on the set } \{ ( a , b ) \mid a , b \in \mathcal { Z } \} \text { where } ( a , b ) R ( c , d ) \text { means } a = c \text { or } b = d \text {. }$$