Prove two sets

[Albi]

Can someone help me with the next step?

 

[Albi]

Found the solution

 

[Dr.Peterson]

You didn't clearly state the problem you were working on; I suppose you want to prove the first line? As written, that appears to be given.

Your notation is poor; you can't put [MATH]\iff[/MATH] between two sets.

But it's good that you solved it.

 

[Albi]

You didn't clearly state the problem you were working on; I suppose you want to prove the first line? As written, that appears to be given.

Your notation is poor; you can't put [MATH]\iff[/MATH] between two sets.

But it's good that you solved it.

Thanks I'll work on improving my notation