John Carlos Baez on Twitter: "An example is the Paris-Harrington principle. You can prove it using the usual axioms of set theory... but not using Peano arithmetic. It took me a long
PDF) Sharp phase transition thresholds for the Paris Harrington Ramsey numbers for a fixed dimension | Andreas Weiermann - Academia.edu
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PDF) The Paris-Harrington Theorem in an NF context | Thomas Forster - Academia.edu
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