User:Lord Farin/Books/Kunen Foundations

= Processing of 'The Foundations of Mathematics' =



Rigour on Model Theory and Proof Theory. Also Set Theory, but that's already covered a lot, so I'm skipping the naive set theory approach taken in the first part of the book.

Progress thus far
Initial set-up complete. &mdash; Lord_Farin (talk) 21:03, 5 January 2016 (UTC)

Paragraph $\text{II}.8$ somewhere, last located Satisfiability preserved in Supersignature

Up to $\text{II}.8.22$ Theory of Structure is Complete. &mdash; Lord_Farin (talk) 16:06, 10 May 2022 (UTC)

Up to $\text{II}.8.25$ Alphabetic Substitution is Semantically Equivalent. &mdash; Lord_Farin (talk) 15:18, 17 May 2022 (UTC)

Missing Proofs

 * Exercise $II.8.25$: Alphabetic Substitution is Semantically Equivalent

Skipped thus far (that is, what needs to be done still)

 * Discussion of types of substructure (subgroup, subsemigroup) etc. after $II.8.17$
 * Exercise $II.8.20$ establishing that completeness does not hold regarding an extended signature
 * Exercise $II.8.26$ extending Alphabetic Substitution is Semantically Equivalent to substitutions in subformulas

Other things
The definition of Kunen for Definition:Language of Predicate Logic is slightly different because it is in Polish notation. This page needs to be set up, similar to Definition:Language of Propositional Logic/Keisler-Robbin.