1. ## Set Replacement

hello,

I have a question about set replacement.

When we have a set like :
A
= { x : is in Z | x < 7 · x - 2 }

Arent we supposed to look for the integers that if we subtract 2 from them the result will be less than 7. Like, 5 for instance, 5-2 = 3 and 3 is less than 7 then 3 is a member of the set.. not sure if I'm going in the right direction here. Just wanna what should we do first, test the predicate (x<7) then apply the number to the (x-2) and see again if its less than 7 or what exactly. ?? I dont see how the bold big dote is suppsoed to operate here ??

Hope some will help. Thanks in advance.

2. Wow.. I didnt think it would be such a difficult question.

3. Originally Posted by MMM88
hello,

I have a question about set replacement.

When we have a set like :
A
= { x : is in Z | x < 7 · x - 2 }
x < 7 · x - 2 notation is not clear...

Put parenthesis to explain your question clearly...

4. Actually this is exactly how I have it in my text book and thats why I was askin about the bold point in the first place..!! Anyway.. I figured it out and thanks for the help.