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He has been a Fulbright Fellow to Brazil and a National Academy of Sciences Scholar to Poland. He has written books on propositional logics, computability, and predicate logic. In his recent work has enlarged the scope of modern formal logic considerably.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.