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Results tagged with collatz-conjecture
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user 5917
The Collatz Conjecture, also known as the 3n+1 conjecture, is a famous open problem named after Lothar Collatz.
10
votes
Undecidable easy arithmetical statement
To talk about undecidability, you have to specify the system.
I consider the simplest system in which you can do real mathematics a system with proof strength $I\Sigma_1$ (feel free to disagree).
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