Skelet 26

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1RB1LD_1RC0RB_1LA1RC_1LE0LA_1LC--- (bbch), called Skelet #26, was one of Skelet's 43 holdouts and one of the last holdouts in BB(5). It is a Shift overflow counter and has an individual proof of non-halting in Coq-BB5.[1]

Skelet 15

1RB---_1RC1LB_1LD1RE_1LB0LD_1RA0RC (bbch), also called Skelet 15 is equivalent to Skelet 26.

References

  1. ↑ https://github.com/ccz181078/Coq-BB5/blob/main/BusyCoq/Skelet26.v
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