Let R be the relation {(a,b) | a (is not equal to) b} on the set of integers. What is the reflexive closure of R?
Do you know what these words mean? A relation is "reflexive" if, for every "a" in the set, it is true that aRa. The "reflexive closure" of a relation is the smallest set of pairs, containing the given relation that is reflexive. Here aRb as long as a is not equal to b. What do you get if you add nRn for every integer n to this set?