I've started reading the book Set Theroy and Logic by Robert R. Stoll (Dover edition) to keep myself active over the summer break.
I came accross a weird problem (problem 2.1) early on. It reads as follows:
"Try to devise a set which is a member of itself."
I gave it a good college try, but I still cant understand this problem. The way its framed with "try" is starting to make me suspicious if this can be done at all. What do you guys think about this problem?