Can someone help me with this assignment? The R1\R2 is confusing me. I attached a scanned copy of the assignment. I think critiquing wise, I understand what the "Suggested Proof" had done incorrectly, but correctly starting me is confusing me as well. Help, please?

Question

anonymous · Answer

Here it is.

anonymous · Answer

Also, I understand the "Suggest Proof"'s proof until the very last line. I don't understand how they concluded (y,x) is in R1 but (y,x) is not in R2.

anonymous · Answer

Ya im wondering abt that too
I think everything up to that point makes sense

anonymous · Answer

Hey can you remind me what R_1\R_2 means
In R_1 and not R_2

anonymous · Answer

?

anonymous · Answer

Yea so basically it reads: R1 difference R2; or: Everything that is in R1 but not R2. |dw:1427256814635:dw|