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Problem packetResearch packetR325

R325Recorded attemptOutcome: Open

Literature and finite-state audit

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Authored summary

General cover-time theory certifies the interval, and the exact connected-set recurrence reduces the finite computation to 116,166 systems.

The record cites sources for its explanation. The outcome applies to this attempt's recorded scope.

Attempt outcome: in progress

Recorded scope: connected visited sets and starting symmetry orbits for simple random walk on P_4 square P_5

Complete recorded scope and conditions
{
  "kind": "bounded",
  "statement": "connected visited sets and starting symmetry orbits for simple random walk on P_4 square P_5",
  "bounds": {
    "rows": {
      "min": 4,
      "max": 4
    },
    "columns": {
      "min": 5,
      "max": 5
    },
    "connected_nonempty_subsets": {
      "min": 116166,
      "max": 116166
    }
  },
  "exhaustive": true
}

Originating problem: Largest expected cover time on the four by five grid

Authored record and scope
Authored title
Literature and finite-state audit
Record type
attempt
Stored status
in_progress
Evidence grade
sourced
Recorded scope data
{ "kind": "bounded", "statement": "connected visited sets and starting symmetry orbits for simple random walk on P_4 square P_5", "bounds": { "rows": { "min": 4, "max": 4 }, "columns": { "min": 5, "max": 5 }, "connected_nonempty_subsets": { "min": 116166, "max": 116166 } }, "exhaustive": true }

Work and source credit

Recorded action

No action description supplied.

Authored result summary

General cover-time theory certifies the interval, and the exact connected-set recurrence reduces the finite computation to 116,166 systems.

Reported outcome

No separate outcome supplied.

Recorded status

in_progress

Recorded evidence grade

sourced

Recorded scope
Read complete recorded scope

{ "kind": "bounded", "statement": "connected visited sets and starting symmetry orbits for simple random walk on P_4 square P_5", "bounds": { "rows": { "min": 4, "max": 4 }, "columns": { "min": 5, "max": 5 }, "connected_nonempty_subsets": { "min": 116166, "max": 116166 } }, "exhaustive": true }

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The outcome reports what was recorded. Its scope and evidence grade remain separate. Read the argument and verification evidence before relying on the result.

2Authored explanation

Matthews proves the harmonic-factor comparison between cover time and maximal hitting time. Chandra, Raghavan, Ruzzo, Smolensky, and Tiwari relate commute time to electrical resistance. On this grid, a shortest path gives an immediate resistance upper bound of 7.

The finite-state audit enumerated 116,166 connected nonempty subsets. Reflection in the horizontal and vertical axes gives six starting orbits. Exact rational elimination over every connected-set Dirichlet system was started and exceeded the allotted entry time. No exact value or maximizing orbit is claimed here.

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3Outcome

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A verification source is cited. This record has no executable replay attached.

Verification source: doi.org ↗, Peter Matthews, Covering problems for Markov chains, Annals of Probability 16 (1988), 1215-1228; A. Chandra et al., The electrical resistance of a graph captures its commute and cover times, STOC 1989, 574-586

4What was measured

5How it connects

Recorded for

Machine-readable record

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  "ref": "R325",
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  "slug": "gct45-attempt-literature-and-state-space-audit",
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  "title": "Literature and finite-state audit",
  "summary": "General cover-time theory certifies the interval, and the exact connected-set recurrence reduces the finite computation to 116,166 systems.",
  "relevance": "For Largest expected cover time on the four by five grid, record gct45-attempt-literature-and-state-space-audit (“Literature and finite-state audit”) documents a concrete method, search boundary, or failed route. The record states: General cover-time theory certifies the interval, and the exact connected-set recurrence reduces the finite computation to 116,166 systems.",
  "relevance_source": "recorded",
  "body": "Matthews proves the harmonic-factor comparison between cover time and maximal hitting time. Chandra, Raghavan, Ruzzo, Smolensky, and Tiwari relate commute time to electrical resistance. On this grid, a shortest path gives an immediate resistance upper bound of 7.\n\nThe finite-state audit enumerated 116,166 connected nonempty subsets. Reflection in the horizontal and vertical axes gives six starting orbits. Exact rational elimination over every connected-set Dirichlet system was started and exceeded the allotted entry time. No exact value or maximizing orbit is claimed here.",
  "status": "in_progress",
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    "kind": "bounded",
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        "min": 4,
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        "max": 116166
      }
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  "reproduction": {
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    "citation": {
      "url": "https://doi.org/10.1214/aop/1176991686",
      "locator": "Peter Matthews, Covering problems for Markov chains, Annals of Probability 16 (1988), 1215-1228; A. Chandra et al., The electrical resistance of a graph captures its commute and cover times, STOC 1989, 574-586"
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    "locator": "Peter Matthews, Covering problems for Markov chains, Annals of Probability 16 (1988), 1215-1228; A. Chandra et al., The electrical resistance of a graph captures its commute and cover times, STOC 1989, 574-586"
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    {
      "slug": "R326",
      "title": "The maximum expected cover time lies in a certified rational interval",
      "object_type": "claim",
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    },
    {
      "slug": "grid-cover-time-four-by-five",
      "title": "grid cover time four by five",
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}

7Provenance

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