Can’t resist, though it’s not quite relevant:
a version of [Russel’s] paradox that is often used to explain it in
concrete terms. It goes like this.
In a certain village, the barber shaves all (and only)
the men who do not shave themselves.
Who shaves the barber?
If it's the barber there's a contradiction -- he is shaving himself, but he's
to shave those who do not shave themselves.
If someone else shaves the barber, there is also a contradiction -- the barber
supposed to shave those who do not shave themselves.
But if the barber is a woman (or a robot), there is no paradox. ;-)
Russel lived in a sexist age. Us moderns know better.
Moral: be sure you understand your assumptions – always a
good idea. The IBL formulation doesn’t mention anything about men (or