union and intersection of intervals

Question

E={v|v<1}

F={v|v>8}

Answer 1

Union is uniting the two sets (intervals) into one set:

E U F = {v | v < 1 U v > 8}

Intersection is where the two intervals overlap. Since they do not overlap, the intersection is the null set.

E ∩ F = { ∅ }