Recent content by marinalee

Perfect! Thanks! :D

Um...I don't get it. :( What does A/D imply other than x is in A and not in D?

Oh! I think I get it. So the proof is: Consider x element of A/D. This means x is an element of A and not of D. This means x is a member of B, because all members of A are members of B, and since we already know that x is not an element of D we can combine these two facts and say x is an element...

Okay, I'll change that. But how do I finish the proof?

Homework Statement Prove that if A is a subset of B then A/D is a subset of B/D. Homework Equations The Attempt at a Solution Consider element x of A. Since A is a subset of B then for all x element of A, x is an element of B. Consider element x of A/D. If x is an element of D...