The action on the set 4 How do.1. Union (union) 2. inter se action (intersection). 3. give up comfort apartment (complement). 4. the variance (the difference). 1 Union.A ∪ B = {x | x is a member of A or B is a member of x}.
Action on the set was 4 to 1. Union. (Union) 2. intersect action. (Intersection) 3. complement apartment. (Complement) 4. Difference (Difference) 1 Union A ∪ B = {x | x is a member of A or x is a member of the B}.