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264 views

Comparison of model-theoretic and axiomatic approaches to NSA

This question is motivated by the discussion in the comments to this post. The question concerns a comparison of model-theoretic (extension) approaches to nonstandard analysis, and axiomatic (syntact …
5 votes
1 answer
411 views

Constructive compactness for countable models?

The compactness theorem for countable (Tarski?) models is equivalent to the weak König's lemma by a result of H. Friedman and others as noted here, in the context of classical logic. The weak König's …