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Jul 6, 2021 at 7:32 comment added user44143 Frege's program has been revived, under the banner of Hume's principle; see en.wikipedia.org/wiki/Hume%27s_principle or jstor.org/stable/2275220
Dec 7, 2019 at 17:15 comment added Hollis Williams You're right that there is definitely more to this story, perhaps someone else who knows more about it can go into more detail here.
Dec 6, 2019 at 14:30 comment added Ben Burns I think this answer can be expanded a bit (perhaps by someone more knowledgeable than myself). Russell and Whitehead continued work on the idea, but about the same time of the second edition of Principia Mathematica, Godel published his papers and that kind of killed the project, with some implications for Hilbert's open problems at the time. (I can't find a good source, but IIRC, Russell continued to work on his theory of classes, or at least revisited the idea a little some years later.)
S Dec 4, 2019 at 11:15 history answered Hollis Williams CC BY-SA 4.0
S Dec 4, 2019 at 11:15 history made wiki Post Made Community Wiki by Hollis Williams