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Feb 26 at 19:07 history edited Timothy Chow CC BY-SA 4.0
Added another illustrative example by Conway
Aug 12, 2022 at 9:36 comment added Martin Sleziak The paper Conway: On unsettleable arithmetical problems is available on JSTOR, too. I tried to find a copy without paywall - I only found this one.
Aug 12, 2022 at 8:01 history edited Martin Sleziak CC BY-SA 4.0
http -> https (the question was bumped anyway)
Aug 10, 2022 at 13:43 history edited Timothy Chow CC BY-SA 4.0
Added reference to Conway's paper
Nov 3, 2021 at 14:06 history edited Timothy Chow CC BY-SA 4.0
Rewrote answer for greater clarity and accuracy
Aug 25, 2011 at 18:18 history answered Timothy Chow CC BY-SA 3.0