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On 8/18/2024 5:32 AM, Mikko wrote:But that is an act you can not do by the rules of logic.On 2024-08-17 14:45:45 +0000, olcott said:They redefined the notion of a set in set theory and that
>On 8/17/2024 9:40 AM, Richard Damon wrote:>>>>No, you said that "ALL THEY DID" was that, and that is just a LIE.>
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They developed a full formal system.
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They did nothing besides change the definition of
a set and the result of this was a new formal system.
Yes they did. They did show that the new system is similar enough to
the old systems to be called "set theory" and sufficiently useful.
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by itself got rid of Russell's Paradox. Mostly this disallows
a set to be a member of itself.
I redefine the notion of formal system in math and logic
and this by itself gets rids of undecidability. Mostly this
rejects self-contradictory expressions.
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