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- Tetrational Goodstein Sequences https://en.wikipedia.org/wiki/Goodstein%27s_theorem 5 comments math
- Have a look at this wonderful theorem which is true but cannot be proved (in Peano Arithmetic) - Goodstein's theorem (1944) https://en.wikipedia.org/wiki/goodstein%27s_theorem 13 comments math
- Goodstein's Theorem: A "sensible" theory about numbers unprovable in Peano arithmetic http://en.wikipedia.org/wiki/goodstein%27s_theorem 6 comments math
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