Bertrand Russell tattoo.
I'm having a friend design for me a Bertrand Russell tattoo and I want to have something symbolic flanking the tattoo besides just his portrait. Russell's famous paradox of course jumps to mind, but when I look up the form written in modern mathematical notation it becomes quite long (and my shoulder is quite small). I'm not sure where I can find the core defining elements written in Russell's original notation (specifically, defining a set containing all sets not containing themselves).
Can anyone help me on this or does anyone have any other ideas?
Thanks a lot.