Thomas comments on But Somebody Would Have Noticed - Less Wrong
You are viewing a comment permalink. View the original post to see all comments and the full post content.
You are viewing a comment permalink. View the original post to see all comments and the full post content.
Comments (250)
Original form of Russell's paradox: Let A be the set of all sets and let P(A) be the powerset of A. By Cantor, |P(A)| > |A|. But, P(A) is a subset of A, so |P(A)|<=|A|. That's a contradiction.
The original form of Russell's (Zermelo's in fact) paradox is not this. The original form is {x|x not member of x}.
That leads to both
and
And that is the original form of the paradox.
No. See for example This discussion. The form you give where it is described as a simple predicate recursion was not the original form of the paradox.