Definition 6.3.1. Reflexive Relation.
Let \(A\) be a set and let \(r\) be a relation on \(A\text{.}\) Then \(r\) is reflexive if and only if \(a r a\) for all \(a \in A\text{.}\)
Part | reflexive? | symmetric? | antisymmetric? | transitive? |
i | yes | no | no | yes |
ii | yes | no | yes | yes |
iii | no | no | no | no |
iv | no | yes | yes | yes |
v | yes | yes | no | yes |
vi | yes | no | yes | yes |
vii | no | no | no | no |