Russell's Paradox is a real-world logic paradox discovered by Bertrand Russell in 1901.
Zantra, a well-known Zaranite philosopher, solved the paradox at some point during his 400-year lifespan. His solution was taught in all Vulcan schools.
In 2273, upon meeting Zantra, Spock complimented him on his solution to the paradox. (TOS comic: "The Real McCoy")