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"Here at Wisconsin we didn't get an undergraduate course in mathematical logic until the '60s."
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"A thousand minus one is never a thousand."

"Where's your common sense? None of those books agree with each other. You've been locked up here for years with a regular damned Tower of Babel. Snap out of it! The people in those books never lived. Come on now!"

"Reason itself is fallible, and this fallibility must find a place in our logic."

"There is no logic in logics except an illogical logic."

"The logic of validation allows us to move between the two limits of dogmatism and skepticism."

"Rationality and common sense never goes out of fashion."

"Apriority creates ambiguities among ideas."

"If-Then" is a structured logic of humans' thought,who have memories and imagination in their mind. If both don't exist, Then this quote has never even been written."
Explore more quotes by Stephen Cole Kleene


"I read one or two other books which gave me a background in mathematics other than logic."


"As I say, there was this movement to try to bring philosophers and mathematicians together into an organization where they would talk to each other. An organization wasn't effective unless you had a journal. That's about all I know."


"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."


"I went to Princeton from Amherst, where I split my interests between mathematics and philosophy."


"And what I learned in Church's course. He trained us intensively in his new system, which he was just developing. Two papers were presented. I think the second paper wasn't published until well after the course was finished."
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