Holdouts lists: Difference between revisions
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A '''holdout''' (or undecided machine) is a [[Turing machine]] for which it is not known whether the machine halts or not from all-0 input tape. Holdouts are the machines which [[Decider|deciders]] are unable to decide. | A '''holdout''' (or undecided machine) is a [[Turing machine]] for which it is not known whether the machine halts or not from all-0 input tape. Holdouts are the machines which [[Decider|deciders]] are yet unable to decide. | ||
Holdout lists are often shared by contributors. There is a [[#Downloadable Holdout Lists|Downloadable Holdout Lists]] table where people have added lists with no restriction or independent verification. For some of the entries there is a reference to a spreadsheet that documents what was run to achieve the result. For others, there is additional documentation on the specific BB pages. | Holdout lists are often shared by contributors. There is a [[#Downloadable Holdout Lists|Downloadable Holdout Lists]] table where people have added lists with no restriction or independent verification. For some of the entries there is a reference to a spreadsheet that documents what was run to achieve the result. For others, there is additional documentation on the specific BB pages. | ||
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|0 | |0 | ||
|0 | |0 | ||
| | |1,691 | ||
| | |22,801,601 | ||
|- | |- | ||
!3-symbol | !3-symbol | ||
|0 | |0 | ||
|6 | |6 | ||
| | |97,701,052 | ||
| | | | ||
| | | | ||
| Line 40: | Line 40: | ||
|- | |- | ||
!5-symbol | !5-symbol | ||
| | |75 | ||
| | | | ||
| | | | ||
| Line 48: | Line 48: | ||
|- | |- | ||
!6-symbol | !6-symbol | ||
| | |873,469 | ||
| | | | ||
| | | | ||
Latest revision as of 21:20, 29 September 2025
A holdout (or undecided machine) is a Turing machine for which it is not known whether the machine halts or not from all-0 input tape. Holdouts are the machines which deciders are yet unable to decide.
Holdout lists are often shared by contributors. There is a Downloadable Holdout Lists table where people have added lists with no restriction or independent verification. For some of the entries there is a reference to a spreadsheet that documents what was run to achieve the result. For others, there is additional documentation on the specific BB pages.
The table with the "Number of holdouts" is based on the holdout lists listed in the table below it. Thus, some of these numbers have not been independently verified. All the zero entries (no remaining holdouts) have been verified.
| 2-state | 3-state | 4-state | 5-state | 6-state | 7-state | |
|---|---|---|---|---|---|---|
| 2-symbol | 0 | 0 | 0 | 0 | 1,691 | 22,801,601 |
| 3-symbol | 0 | 6 | 97,701,052 | |||
| 4-symbol | 0 | 434,787,751 | ||||
| 5-symbol | 75 | |||||
| 6-symbol | 873,469 |