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Apr 13, 2017 at 12:32 history edited CommunityBot
replaced http://cstheory.stackexchange.com/ with https://cstheory.stackexchange.com/
Feb 26, 2011 at 18:10 history edited John Sidles CC BY-SA 2.5
The undecidability assertion now is called "Viola's theorem"
Feb 19, 2011 at 0:50 history answered John Sidles CC BY-SA 2.5