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Published online by Cambridge University Press: 01 April 2022
The usual objections to infinite numbers, and classes, and series, and the notion that the infinite as such is self-contradictory, may ... be dismissed as groundless. There remains, however, a very grave difficulty, connected with the contradiction [of the class of all classes not members of themselves]. This difficulty does not concern the infinite as such, but only certain very large infinite classes.
—Bertrand Russell, The Principles of Mathematics, p. 362