> Suppose R and S be the relations on z by defined :a R b ⇔ a≡b(mod 9) aSb ⇔a[YOUTUBE]≡[/YOUTUBE]b mod 6) find (RUS)^(infinity )and A/(((RUS))^(infinity));
>
Do you mean find as in everything in all the sets in ? There are a total of such sets.
If then . Thus, and (although the follows from the formula every time you plug in the ). So, the elements related to under and are the elements, .