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Ideas for 'The Science of Knowing (Wissenschaftslehre) [1st ed]', 'What is a Law of Nature?st2=David M. Armstrong' and 'Axiomatic Theories of Truth'

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3 ideas

5. Theory of Logic / K. Features of Logics / 3. Soundness
Normally we only endorse a theory if we believe it to be sound [Halbach]
Soundness must involve truth; the soundness of PA certainly needs it [Halbach]
You cannot just say all of Peano arithmetic is true, as 'true' isn't part of the system [Halbach]