Question

Prove the following property using the example : If A ⊆ B, then A ∩ B = A

Answer 1

Step-by-step explanation:

I’m going to use & for intersection.

If x is in A the x is also in B so x is in A&B

If x is not in A then x is not in A&B.

Therefore x is in A iff x is in A&B => A=A&B.