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Ideas for 'Axiomatic Theories of Truth (2005 ver)', 'Grundgesetze der Arithmetik 2 (Basic Laws)' and 'Ontology and Mathematical Truth'

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2 ideas

4. Formal Logic / F. Set Theory ST / 1. Set Theory
'Impure' sets have a concrete member, while 'pure' (abstract) sets do not [Jubien]
To prove the consistency of set theory, we must go beyond set theory [Halbach]