Reflexive relations
6.1
A relation R on a set A is called reflexive if aRa for every
element a of A.
Which of the following relations on the set of integers are reflexive?
R1={(a,b) | a?b}
R2={(a,b) | a>b}
R3={(a,b) | a=b or a=-b}
R4={(a,b) | a=b}
R5={(a,b) | a=b+1}
R6={(a,b) | a+b ?3}
Yes
No
Yes
Yes
No
No
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