a paradox of set theory in which an object is defined in terms of a class of objects that contains the object being defined, resulting in a logical contradiction.
Read more in this article about some frequently asked questions and fun facts related to our definitions.
What’s The #’s Real Name?
How do we currently use the # symbol? On Twitter, Facebook, and Instagram, you tag your friends with the @ symbol and you tag topics with the #. If you see something that says “#WordoftheDay,” the tweet or post has something to do with Word of the Day. And, once you click on that marked topic, you’ll likely see all public posts about it. It’s a …
Origin of Russell's paradox
First recorded in 1920–25; first proposed by Bertrand Russell
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
logic the paradox discovered by Bertrand Russell in the work of Gottlob Frege, that the class of all classes that are not members of themselves is a member of itself only if it is not, and is not only if it is. This undermines the notion of an all-inclusive universal class
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012