Recent content by ktri

I have this question:2. Let R be a relation on Z with $$R = {(a,b) : |a−b| < 3}.$$ (1) Is R reflexive? (If yes, prove it; if no, give a counterexample) (2) Is R symmetric? (If yes, prove it; if no, give a counterexample) (3) Is R antisymmetric? (If yes, prove it; if no, give a counterexample) (4)...