# Russell's paradox

> One of the logical paradoxes - a contradiction - in naive set theory, discovered by Bertrand Russell in or around 1901.

One of the logical paradoxes - a contradiction - in <naive set theory>, discovered by <Bertrand Russell> in or around <1901>.

> Let $R = \{x \mid x \notin x\}$ then $R \in R \iff R \notin R$.

## Articles

- https://plato.stanford.edu/entries/russell-paradox/
- https://en.wikipedia.org/wiki/Russell%27s_paradox