Popper’s Correspondence with Willard Van Orman Quine

Willard van Orman Quine (1908–2000) was an American logician and philosopher working in the analytical tradition shaping it various respects. is well-known for his critical attitude towards modal logic, which makes their conversation about Popper’s formalization of logic Popper (1947d) particularly interesting. The letter from to 6 April 1948 remarkable indication demarcation between mathematics. says that he has formulated inferential definitions cardinal numbers; this would increase scope approach However, idea not been pursued any subsequent publications, we were able find definite traces unpublished work either.