The relation on Z is not a partial order since it is not reflexive o and o is related d and (1, 2) is related, 12 and ( 1, 2 is related, but 1 and 2) is not related, incomparable Related: comparable not related: IncomparableThe relation < on Z is not a partial order, since it is not reflexive  and  is related, {1} and {1,2} is related, {2} and {1,2} is related，but {1} and {2} is not related, incomparable Related: comparable not related: incomparable