Advice, please: Am I giving
this guy too hard a time if I post (after bugging him twice about a reference): "Thanks a lot! Yes, I did really want to know. I also think that if you reproduce a major passage from somewhere you should definitely say where it's from."
Given two sets $A$ and $B$, I want to know the result of:
$$C = A \setminus B$$
If I define the sets $A(n)$ as the set such that:
$$\begin{align*}
A(n) \setminus B &= \emptyset; &\quad &\forall n= 0,1,2,3,\ldots,\infty &\quad &(1)\\\
\lim_{n\to\infty} A(n) &= A &am...
