I have this question but not really sure how to do it when there is union and interception symbol. I am easily confuse when this 2 symbol appear. From my understanding I know that equivalence relation means that it must be reflective, symmetric and transitive. Can anyone guide me. Thanks!
Suppose that $R_1$ and $R_2$ are equivalence relations on the set S. Determine whether each of these combinations of R 1 and R 2 must be an equivalence relation. a) $R_1 \cup R_2$ b) $R_1 \cap R_2$