I had some hesitations about philosophy because, if you worked out a philosophical theory, it was hard to know whether you were going to be able to prove it or whether other theories had just as good a claim on belief.
Stephen Cole KleeneI read one or two other books which gave me a background in mathematics other than logic.
Stephen Cole KleeneI think that after Church got his Ph.D. he studied in Europe, maybe in the Netherlands, for a year or two.
Stephen Cole Kleene