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Feb 15, 2014 at 20:27 comment added domotorp Yes, the difference is that I supposed that every tape content is finite and we know where the boundaries are. Otherwise mortal TM's are just constant, as you write.
Feb 15, 2014 at 20:16 comment added Joshua Grochow @MarzioDeBiasi: The notion of mortal considered in that paper requires a machine halt in a finite number of steps even if it is started with an infinite amount of arbitrary data on its tape. But I think domotorp's construction at most works for finite configurations. For example, in a configuration with an infinite-length input, domotorp's M gets caught in an infinite sequence of copying the infinite-length input to the separate memory tape...
Feb 15, 2014 at 19:38 comment added Marzio De Biasi while writing my answer, I read yours ... which say the opposite :-) ... perhaps I'm wrongly interpreting what is a string accepted by a mortal Turing machine ?
Feb 15, 2014 at 19:28 history answered domotorp CC BY-SA 3.0