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$\begingroup$ Do I understand correctly? For n=6, working tape looks like x----x, -x--x-, --xx--. At any point in time there are at most 2 cells used. $\endgroup$

Jesus is Lord
– Jesus is Lord

2020-05-07 20:28:52 +00:00
Commented May 7, 2020 at 20:28
$\begingroup$ Yes, that's exactly the idea. Each iteration discards one cell from the left and one cell from the right by moving the marks closed to the center. $\endgroup$

Steven
– Steven

2020-05-07 20:30:07 +00:00
Commented May 7, 2020 at 20:30

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