Useless Turing Machines are Undecidable

Here we show that determining if a Turing Machine state is "useless" is undecidable.

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▶ABOUT ME◀ I am a professor of Computer Science, and am passionate about CS theory. I have taught many courses at several different universities, including several sections of undergraduate and graduate theory-level classes. ... https://www.youtube.com/watch?v=PvdnxMmd2lA