Posted by Laurey on Friday, February 4, 2011 at 10:10am.
Justifying your conclusions (you could also use examples in order to illustrate your results).
What can you say about the sets A and B if we know that:
1. A ∪ B = A
2. A ∩ B = A
Thanks for any helpful replies :)

Discrete Math  MathMate, Friday, February 4, 2011 at 3:03pm
1. A∪B = A
=> x∈B > x∈A
=> B⊆A
2. A∩B = A
=> x∈A > x∈B
=> A⊆B
Now
B⊆A ∧ A⊆B
means what?