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Jun 24, 2010 at 19:08 comment added Swapnil Bhatia Yes, this is Rice's theorem. I am stating it for completeness of the list: I don't see it listed.
Jun 24, 2010 at 18:35 comment added Joel David Hamkins Yes, they are undecidable from the programs that decide them. See Rice's Theorem: en.wikipedia.org/wiki/Rice's_theorem
Jun 24, 2010 at 18:24 history edited Swapnil Bhatia CC BY-SA 2.5
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Jun 24, 2010 at 9:54 history answered Swapnil Bhatia CC BY-SA 2.5