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2 votes
1 answer
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Harrington's notes on McLaughlin/Arithmetically incomparable singletons

At one point I had copies of the handwritten notes Leo created about the McLaughlin conjecture and I know a similar set of notes exist titled Arithmetically incomparable arithmetic singletons. I've ...
Peter Gerdes's user avatar
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12 votes
1 answer
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How to locate the paper that established Robinson Arithmetic?

If I'm not mistaken, it was in his seminal paper “An Essentially Undecidable Axiom System”, published in Proceedings of the International Congress of Mathematicians (1950), 1952:729–730, where R.M. ...
Jose Brox's user avatar
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